since you are obviously very new to this ill rehash proper injection procedures for you:
1- best to do it after a shower, use good antibacterial soap like dial,
2- grab 3 acohol preps, your vial, and 2(TWO) pins
3- wipe the top of the stopper with the first acohol prep
4- take first pin and draw out of vial however much you need
5- set pin (sheathed) on counter
6- use second alcohol prep to clean off selected body part
7- switch pins so you are injecting with a sharp, clean pin
8- push pin into meat
9- aspirate so you dont hit a vein etc
10- inject slowly, approx 1 minute per cc
11- pull pin out, take third alcohol prep and keep pressure on the area while rubbing hard for at least 5-10 minutes
heating the vial to begin with can help as well, but depending on what ur doing it may not be necessary... also its not like you HAVE to inject after showering, but personally i feel like its best to get rid of as much bacteria etc as possible.
also, other places to inject include- quads, calves, shoulders, bis and tris