BarryRx here is a link that includes high fiber foods.
High Fiber Foods List for a High Fiber Diet
You will notice beans contain the highest fiber. Do not use canned beans as they are lower in fiber and high salt. Dry beans are the best and I have a lot of great recipes if your interested.
Old fashion oatmeal and steel oats also provide a lot of fiber. Never peel your apples as that's where the fiber is. The skin on most fruit and potatoes provides the fiber, except banana's.
There are two types of fiber, soluble and insoluble and they both have a important role in digestion and absorption. Here's a link to explain the difference.
Dietary Fiber: Insoluble and Soluble Fiber
When you do go back to eating ditch the white bread, rice and pasta. Whole grains or multigrain is what you want when choosing bread. Switch over to whole wheat pasta and long grain brown rice. These will contain more fiber vs. the white.
Google is a vast source of dietary information and I used it often when making the switch to healthy eating. A lot of good information at your fingertips.
Good luck to you on your healthy journey. It's not always easy to do, so be diligent and remain focused upon your long term health goal.