Get some books. Read them. I assume your 5.56 is for a gas rifle, so you have to get powders proper for a gas rifle. TAC, Varget, IMR4895, H4895, AA2520. I like ball powders but find AA4064 works well with77 grain BTHP.
Any fast powder to begin with for the 9mm. Zip, Bullseye.
Get to work.