If you have multiple armies loan them one of yours for a game. If you design both lists and give them choice of army they begin playing with a good army straight off. Better yet give them the better list. You derive experience in its use by playing against it too.
Experience is a better learning tool than lots of theoretical ramblings on the experts part.
Also limit the troop types used by both sides. There is so much to learn at first that it will help them if you can reduce information overload. Help them set up and explain why they should set up that way. Set up first and then tell them which of their units are effective against yours, and vice versa. For their second game you should each make up your army as normal-ie.secret.