Does anyone have some suggestions for how to keep bloog sugar at normal levels when you have diabetes?

Yes. Be compliant with your treatment protocol: follow the proper diet, exercise regularly if you can, take your medications as prescribed and follow-up with your doctors at appropriate intervals. There is no cure for diabetes at this time but on a proper treatment regimen, it can be controlled and you can prevent development of complications.
Diet and exercise. The answer to this quesetion is really complex and highly individual. In general it involves regular exercise, a dietary regimen preferably from a dietician, and medications prescribed by the doctor. The last item might possibly be unnecessary, but that is the doctor's call.