May I suggest a 1/35 scale kit.
!/35 scale seems to be the standard here in the u.s.
I was looking in a catolog from model expo today and saw they had a 1/35 scale
Russin T-34/76 for around 18 bucks from tamiya.
Not a bad price.
It is a very basic kit that will look good when you finish it.
A good kit to learn the fundimentals of armor.
Italeri also has alot of good kits to learn on that look good when your done.
The quality of the kits are not the best but are far from the worst kits out their.
Welcome to the dark side of modeling.
Once you are bit by the armor bug your toast.
I used to build aircraft until I built my first tank .
After that their was no looking back.
P.s.
check out modelexpo.com
Theirs tons of stuff on that site.