Hi Stacey
Welcome to the forum. Being diagnosed with Diabetes is a big shock, and there is a lot to take on at the start, but it does gradually get easier, and then you can start to fine tune your management. There are loads of people on the forum here with very useful, realistic and empathetic advice. Just keep in touch and let us know how you are getting on, and ask questions. I find that there is always someone available to help.
It will take some time for your insulin needs to get sorted out at the start, and when you are ready the Diabetes Specialist Nurses will work with you to teach you how to adjust your insulin doses at meals.
Newly diagnosed should be given access to an education course about this. In some areas it is called Dose Adjustment For Normal Eating (DAFNE), in others there are equivalent courses. There is sometimes a waiting list for this so you could ask about it at your next appointment and see what is available when in your area.
I am no expert on the different foods as I still eat carbs with my meals and inject the insulin to match this. On this forum there is a whole thread for food questions and I have found very useful info in there (just go back to the Home >Forums> Food.