Mighty Mite Football...which offense to run?

First year coaching Mighty Mites football! Team consists of 25 players, ages are between 6-8 years old. Of the 25, only 9 can be 8 years old, so we are dealing with young kids. I want a simple yet effective offense. Passing is probably out of the question at this age but a power run game is probably ideal. Any suggestions (full house, power i, wing t, etc.) would be greatly appreciated as well as, locations to find plays would be awesome. Thanks in advance. Email or reply would be great. If ok to contact, I'd appreciate.

- Coach Lance