Well, you probably should try and find a PDF of the 5th Edition rulebook somewhere.  A good portion of it is real basic n00b stuff, which could be helpful for you, however a lot of it is really, really nice since it contains all sorts of info about rules and weapon types.  Note that that's just the rulebook, it contains no unit lists for any race, so you'll need to grab the codices separately.

So for your first question, yes, other races can take vehicle squadrons.  Tau Piranha and Tetra speeders are in squadrons, as are Space Marine Land Speeders.  To the best of my knowledge though the Imperial Guard are the only ones who can take main battle tanks and self-propelled artillery in squadrons.

For question number two, any army can have a maximum of two HQ choices, six troop choices, three fast attack choices, three elite choices, and three heavy support choices.  No army however can have anything less than one HQ choice and two troop choices.  And to represent the without number horde that is the Imperial Guard, an IG army can get for a single troop slot a Platoon Command Squad, 2-5 Guardsmen squads, up to 5 Heavy Weapons Squads (each with three heavy weapons), up to 5 Special Weapons Squads, and a Conscripts squad for use as a meatshield, which they do wonderfully since they are 4 points per Conscript and a single squad can have up to 50 of them.

Of course, the most devastating weapon in the IG arsenal is not its tanks, nor its infantry, but a man known as Lord Castellan Ursarkar E. Creed who can be taken as a HQ choice and allows any unit in a player's army to have the Scouts special rule, which allows them to Outflank if kept in reserve (which means they get to move in from one of the table edges when deploying from reserves).  So yes, as some of the less outrageous Creed writefaggotry says, Creed can indeed make Leman Russ tanks appear out of nowhere, since his rule does not include any limits on what unit can be given the Scouts rule.

No offense, but why would you think Wraithlords can be organized in a squadron just because War Walkers can?  I'm not trying to be mean or anything; I'm just trying to find out what Wraithlords and War Walkers have in common that would lead you to think Wraithlords might possibly be capable of being a squadron.

Let me put it this way: Unless it is specifically stated somewhere, it doesn't exist.

There's walker walkers (which are a type of vehicle) and there's things which walk (which includes infantry and monstrous creatures).  The Wraithlord is not a vehicle despite it being a Heavy Support choice; its actually a Monstrous Creature which is a special type of infantry with some special rules.  Keep in mind this is TT, not DoW where things that take vehicle cap are vehicles and squad cap units are infantry squads.  Heavy Support Wraithlords are not vehicles, and neither are Space Marine Devastator squads.  Space Marine Dreadnoughts are an Elite choice, just like Terminators, and Space Marine Land Speeders are Fast Attack, just like Assault Marines.

Monstrous Creature special rules are Move Through Cover, Relentless, can fire two ranged weapons per turn, and roll 2d6 for vehicle armor penetration in close combat, plus they typically have T6+ so it is hard to cause a wound against them.

I know the feeling abut not havin a store, I live in whitewater  right in middle of ever major town and there is not a gamesworkship store with in 45 mins of me.

also it seems that no one really plays around me.

me and some firends use to play table top so I have couple armys, but no way to play game any more be honest i really wish they come out with a table top turn based game for warhammer 40,00 they could sell core game comes with one army and then sell expasion armys i am sure it make good sales and would sell well, and i am also sure that it would not hurt the hobbiest most people even if they cant play enjoy making models and painting the armys like my self.

but reaosn they do not make a turn based computer game is that excuse is that it would damage there model sales for the table top game.

these days my friends scatterd around the wind friends are all in armed forces japan so forth station all over so we cant play any more but we would if we had way to so still waiting for company to get the table top game into the 21st centry

See! See!

I knew, just knew that the Imperial Guard ... using mass infantry to support AMAZING TANKS!! has one of the best armaments of ranged weaponry!!

and dis-regard the fact that most Imperial companies/regiments use only las-guns ... veteran companies led by experienced commanders (or commisars) can afford for ~30% of their regular forces to use either Plasma Rifles or Rocket Launchers!!

Albiet, while there will still be twice as many infantry companies WITH only las-guns ... Elite Commisar led Guard Units are the BEST mixture of kickassery and cannon fodder (especially if equipped with some Missle Pods/ Rocket Launchers...)

And of Course, with the LemanRuss and the Artillery in the back (who cares about friendly fire) and ... MAYBE EVEN A BANEBLADE!!! [drools]

Valkyries and Vendettas are a squadron of 1-3, Chimeras are independent.  Valkyries and Vendettas are Fast Attack though while Chimeras are Dedicated Transports and use no FOC slots.

And meltaguns have a pitiful 12" range and only roll 2d6 for penetration at 6" or less, so not useful considering Guardsmen have 5+ saves and will be lucky to get within 12" of their target, never mind 6".

And Vanquisher is only 72" with S8 and AP2, and it rolls 2d6 for armor penetration.  Its only 5 more points than a regular Leman Russ, but it doesn't have the ability to wipe out half a squad of Space Marines in a single shot so it isn't something I would use.

And Manticore is better than Deathstrike.  You only get one Deathstrike missile, and you have to roll a die to be able to launch the missile, and Manticore has a 120" range, four shots,  and each shot does d3 large blasts at S10 AP4.

FOC = Force Organization Chart.  You know, the two HQ, six Troop, etc. thing?

And troops can fire after disembarking, but six inches is spitting distance and transports only move 12" at cruising speed and a Chimera has armor of 12/10/10 so getting nailed in the side with a lascannon or missile launcher is pretty much a guaranteed penetrating hit.  You may have to advance a few turns under fire and hope the Chimera doesn't get Immobilized or Destroyed.

And the Eradicator doesn't mount the Hellhammer cannon; it mounts the Eradicator Nova Cannon which is 36" S6 AP4 Heavy 1 Large Blast and ignores cover, plus the Eradicator costs 10 points more than the regular Leman Russ.

And the Manticore is better than the Basilisk since an average game only has 6 rounds.  A Basilisk will get off 6 shots, while the Manticore will do anything from four to twelve.  Besides, volume of fire can be as important as duration of fire.  Being able to hit a unit with three S10 large blasts at once can be very useful.

Oh, okay I get tht part now. Thanks for the info.

*drools* Eradictor Nova Cannon. It may be short range, but it will esplode your face off.

What's the longest game you've ever played/heard of played?

Unfortunately I'm not sure where to get the PDF versions other than the GW site (which seems to have only a smattering of items).