A lot of newly diagnosed people go on a low residue diet. Basically, that's low fiber. You want to avoid anything that's hard to digest. Nothing with a shell or husk, like corn, peas, beans. No gassy foods, like brocolli or cabbage. Carbonated beverages can be a problem.
Things to try: mashed potatoes, applesause, bananas, eggs, chicken, turkey, fish, well cooked green beans and carrots, rice, canned peaches or fruit cocktail, yogurt, organic cottage cheese with active cultures (Horizon is one brand). If you drink milk, try lactose free. Even if you've never been lactose intolerant, changes in the GI tract from the disease can make digesting lactose a problem. The live cultures in yogurt and organic cottage cheese eat up the lactose, so it's not such a problem there. Try to get some protein with each meal or snack. Your body has a lot of repair work to do and it needs the protein.
The above suggestion to eat small meals is a good one. Even if you find yourself eating seven or eight times a day. Overloading your system with large meals will just make you miserable.
A lot will be trial and error. Everyone's system reacts differently and what works for one can make someone else sick. I know this is a scary time. I was just diagnosed this summer, too. All the new info can be overwhelming. Don't be shy about asking questions, either of your doctors or here. With some time and some research and experimenting, you'll figure out what works best for you.