Hmmm, go buy
Frontiers. They have a really elegant rule set for play and you can replace all their tokens with your miniatures. The game itself plays fast and is basically a stripped down miniature game.
If you want to take the time, you can then adapt the rules they use to your particular brand of miniatures (if modern / futuristic day). Not as easy for medieval - I think Okko has a better set of rules for medieval warfare miniature play.
Otherwise, Descent is a whole different ballgame that gives you all the tile pieces, rules, tokens and miniatures that you could want. You could even add your own monsters to the mix later on, once you get comfortable. Basically, in Descent, one player plays the Overlord who gets 'threat' that allows him to play cards from his hand. Those cards range from traps to spells to monster summonings. The heroes attempt to raid the dungeon and can die as often as they like (and rez back in town) but each time they die, they Conquest tokens. If they lose them all (as specified by the quest and gained by specific goals during the quest), they lose and the Overlord wins. Quite fun.
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