Self-education is key with diabetes.
Your situation is not uncommon and all the more reason to learn how to take care of yourself quickly. Learn to count the carbs and to calculate the bolus injection of insulin for this. Find yourself a very good Endocrinologist and Nutritionist that are willing to work with you.
Diabetes is not that hard to take care of, it is just an inconvenience, and it is very confusing at first. You will learn quickly and this will come second nature to you in no time.