I have 4 Genotropin 13.8mg Two-chamber catridges. I however do not have the pen or needles that it is supposed to come with to mix and distribute to yourself. I am stumped. I am getting on this for athlete reasons (growth in height and muscle). Going to be playing football at a college D1 level and need all the info on this I can. How to mix it, and when and how much to give to myself. All help is greatly appreciated.