to the forums! Pull up a keyboard and stay a while.
I'll leave it to the armor experts on first kit suggestions. But you can't go wrong with Revell for WWII warbirds in 1/48. The kits are inexpensive, easy to build and while they aren't the most accurate in the world you can build two or three for the price of one "good" kit.
Search the forums, and have a look through this PDF on the basics:
http://www.finescale.com/fsm/objects/pdf/fsmbooklet.pdf
Enjoy!