Get on Google earth and search for Sunlight Basin. On the way into Sunlight there are a number of campgrounds, Dead Indian Campground, Sunlight Basin Campground, Little Sunlight, there are a few to choose from. They do get used pretty good so you may have to go around to find one you want to stay at.
You WILL see bears, there is no doubt, you WILL see them, just be mind full of what you are doing. Remember there are rules when camping in there. Use the bear boxes, don't leave anything in your trucks, ect... Also use the game poles that are provided in each camp ground if you are successful.
Remember the wilderness rule if you are a non-resident, get a good map or a GPS with a chip so you know where you are at, you can run into wilderness pretty quick the higher you go.
Check the weather, there is a camera and weather station at the top of Dead Indian, use those will tell you what to expect. The weather in Sunlight will be totally different than in Cody, DO NOT open your truck doors if the wind is blowing at the top of Dead Indian. It can get get crazy cold, be prepared especially in a wall tent. I spent an elk hunt that averaged -15 below for a week in there, everything froze.
Sunlight is a great place, you will see lots of animals, mule deer, white tail, elk, moose, bears, and probably some wolves.
Let me know if you have any questions,