Use 20 gauge needles to draw. 18 gauge tend to tear up the stoppers.
3cc syringe
For injecting, 1 23-25g work great everwhere if you're not 20% bodyfat. 1 1/2 for glutes if you are fat or want to be safe. 5/8 of an inch also works great in delts and even quads if you're not fat.