Ok cool. Well, for now its probably best to start with a variety of units to teach her different aspects of the game. Chariots may be a good choice...
In 500pts you can get Prince, Priest, 3 Chariots, 20 Skellie Bowmen... Thats your lot lol. Maybe just 2 x 10 bowmen for this to fill your army requirements.
You should soon see that GW have totally messed up the balancing of the "points" system though...
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