The biggest effect wildfire has on wildlife is how it changes the three things animals need most: food, water, and shelter. Knowing what species of wildlife you have in your area and what you want to do will help you plan a wildlife habitat management strategy.
Revegetating the site is a good place to begin. A call to your local fish and game office can provide you with a list of recommended plant materials for the wildlife habitat you wish to establish.
Riparian areas are especially critical to wildlife habitat. Cleaning debris out of water sources and vegetating the banks of streams, rivers, and ponds will help minimize erosion and also help keep water quality high and temperatures cool, which is especially important for fish.