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I just started an Ork army and I am looking to convert a lot of my damaged or abandoned imperial vehicles into Ork transports and I need plasticard. Where is a good place online to purchase this online? What thickness should I purchase for building and converting vehicles? What size does GW use to build their vehicles? Thank you for any and all help you can give me.

Just Google "sheet styrene" you can also find it on Google.

1mm works good for making the hull of rhino's and things. Pretty much every exterior measurement on a rhino is 1mm.

You might want some .75-.5mm for tacked on armor plates since 1mm will look a little thick.

Note: some companies (American I'm guessing) will use inches instead of mm to denote thickness. Google up a unit conversion calculator to make sure you have the right thickness.

Cutting it can be a problem, you can use a hobby knife to score it (then snap) or you could look for a hot wire cutter or something. I personally use the score and snap method since I’m too broke to invest in fancy tools.

GW plastic glue should work just fine to glue it all together. If not try testers plastic glue/cement because I know that works. However if you are going to glue it to metal use super glue.

They won't just use inches - they will use that peculiarity, the decimal part of an inch - usually listed in "thousandths of an inch" or a "thou" (soft 'th' like thick, not a hard one like Thee, thine, thou).

For the uninitiated, it goes like this:
1mm is close enough to 040 (evergreen code size) or .040"
2mm will be close enough to 080
1.5mm is 060
0.5mm is 020
0.25mm is 010

amazon is usually a good source for plain sheets, especially if you want larger ones, but pay attention to the size and price, it can be a bit strange (first link has 0.03" x 2' x 2' for $8.21 and 0.03" x 1' x 2' for $10.86)
http://www.amazon.com/Impact-Polystyrene-Sheet-D1892-Length/dp/B003SLEZW2/ref=sr_1_2?ie=UTF8&qid=1352085242&sr=8-2&keywords=sheet+styrene
http://www.amazon.com/Plasticard-Variety-Gale-Force-Nine/dp/B001DT3VYO/ref=sr_1_5?ie=UTF8&qid=1352085242&sr=8-5&keywords=sheet+styrene
http://www.amazon.com/Evergreen-Scale-Models-White-Assortment/dp/B0006O5I3Y/ref=sr_1_1?ie=UTF8&qid=1352085242&sr=8-1&keywords=sheet+styrene

Some Distributors:

http://www.evergreenscalemodels.com/Sheets.htm

http://www.plastruct.com/

http://www.gf9.com/

http://www.hobbylinc.com/htm/pls/pls91104.htm

http://store.miniwargaming.com/product/hobby-supplies-plasticard.html

http://www.miniaturemarket.com/gf990440.html?___store=mmonline&gclid=CP_clNLxn7MCFQMFnQodf1oAng

Unfortunately, to get much cheaper than this, you will have to track down a plastic company or chemical company that produces plastic and offers bulk purchase. You might also try Ebay, Amazon, or local equivalents.

You can also go to the local Home Despot or Lowes (home improvement store) and buy plastic signs (for sale, keep out, beware of dog, etc) for dirt cheep. They come in various thickness and sizes so you can select what you think works best.