Diabetes UK have a leaflet called "what to expect from your care team" or something like that. That'll explain about specialist nurses, GPs, retinal scans, feet specialists, dietitians and how they all are "supposed"to work together for you.
Depending on where you live and stuff, you may find it hard to get your "team" to advise you on testing. It's generally thought of (especially by us here, but also increasingly by researchers and the medical establishment) that testing is a good thing because it helps us feel in control of our conditions. On the other hand, this information hasn't reached Northamptonshire yet, where i live and anybody outside the Hospital diabetes centre will tell you not to test at all, unless you're ill.
Andy's advice is good, the one time i saw a consultant at the hospital about my diabetes, he said the same thing.
Rachel