500pts is a good size to start with. Gives you enough to play with to get the hang of the mechanics. It dose take a little time to get used to how units move in WHFB, as it is quite different from 40k.
Virtutis gloria merces
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It's a knife for gods sake, what you been useing to keep your fork company all these years, sharp side, blunt side, what you want a lesson? - Bullet Tooth Tony