Listen to the Andy-man! He knows his stuff. In regards to what kit you should get, you might want to check out this (
http://forum.shrapnelgames.com/showthread.php?t=42009) thread for ideas on infantry. In regards to tanks and armoured kit, don't overballance your armour against your infantry. If you do build a heavy tank core, make sure you pick up infantry in the support.