This is a very basic thing that you need to do your homework on. Needles come in different thickness referred to as needle gauge. The also very in length which is where you get 1 or 1.5 which is an inch or inch and a half. For an intra muscular injection you wanna use anywhere from 22 gauge to 25, some use bigger or smaller. For an Im injection it's a good idea to use at least an inch to 1 1/2 in, but some use smaller. Drawing is reffering to removing the oil from the vial into the syringe. It's easiest to use a big needle for this so 18g is best. If you don't know the higher the gauge the smaller the thickness. As far as the actual injection goes its best to watch vids of it to get an idea of the proper way and areas.
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