I'm just an A cup girl with just estrogen and no impants, but I really think you should hold back on the breast implants, focus on on getting and recovering from the bottom surgery first, I think that will help with your dysphoria much much better. IMHO B cup is already good, especially since you have a thin build. A quality bra that structures your breast nicely with some mild pads will work wonders. Get clothes that are more form fitting, so throw away the loose fitting tees and sweatshirts and hoodies! For your uniform, get them one size smaller!