You really should get your doctor to order a diabetic food class for you (if your insurance covers it.) If not, there should be some booklets and help available thru your local health department. You can also get books from the library that will explain this to you. If necessary, start with an encyclopedia and perhaps a simple paperback book about diabetes that gives you food counts to follow.
There is so much to learn that we can't explain it all here. The best thing to do is follow your food plan, do some regular exercise like walking or swimming laps or jogging, test your blood and keep a journal of your foods, meds and exercise. This will help your doctor with prescribing the correct amounts of meds for you and let him/her see what works best. Together you can build a plan that will work for life.
"People are like stained glass windows: They sparkle and shine when the sun's out, but when the darkness sets in, their true beauty is revealed only if there is light within."
- Elizabeth Kubler-Ross