I'm type 2 diabetic and I felt exactly the same way when I was diagnosed. I felt exhausted constantly, desperate to make changes, and completely overwhelmed by all of the information out there.
There are tons of diets that people have found to be successful and some of them are wildly different. Some people thrive on low-carb/high-fat diets and others feel their best on low-fat/high-carb diets. There's a lot of truth in that "the best diet is the one you'll follow" saying.
There are a few things that do seem to be common in almost all successful diet plans though. Here is what I would personally recommend, especially since you are insulin resistant. (I am too.)
1. Cut down or eliminate high-sugar/high-glycemic food. Sugar, soda, desserts, etc. They will drive your blood sugar up, which will make your body release more insulin. High levels of insulin in your body will keep you feeling sick and exhausted. It will also make it harder for you to lose weight.
2. Increase the amount of fiber you eat. Fiber is filling and helps you eat less. It also helps you avoid your blood sugar shooting up after meals because it lowers the glycemic index of food. Eating a variety of vegetables every day will do more for your health than any vitamin or supplement could.
3. Exercise. If you're new to exercise, start with walking or something else low intensity, like swimming. Exercise will help you burn off excess sugar. It also builds muscle, which speeds your metabolism because muscle uses more calories-- even when your body is at rest.
4. Avoid trans fat. In general, unprocessed/whole foods are better than processed foods. I don't know anyone who advises eating trans fat anymore. It's not even legal to put it in food in some countries.
Ultimately, whatever path you can stick with for life is probably the best for you. The above "rules" are just what I personally find the most helpful and see most people (even on different diets) following. I am rooting for you!


Keep hydrated!