I'm a type 1, but the principles of insulin use are the same. You need to know 2 ratios. Your insulin to carb ratio (how many carbs you can eat per unit of insulin) and your ISF (insulin sensitivity factor). This is how many points 1 unit of insulin will drop you. Most folks start out with an I:C (insulin to carb) of 1:15 and then adjust from there based on what the test results are. Test, test, test and you will figure out what works for you.
Dxd T1 1966, 2001 dialysis, 2002 kidney transplant, 2003 insulin pump, 2008 pancreas transplant