Sounds like you need to spend some more time reading so you understand what GH is and how to use it. I can get you started, but for real, take more time to read and learn. You can search for other questions here in the QA, as well as look at juicedmuscle.com for lots of good info. 

So the best is pharm grade, but it is very expensive. Then comes the Hyge's. Then the colored tops. I believe the grey tops are better than the blue but I have not used them. I do know guys that have used the grey and like them. You need to buy bacteriostatic water to mix with your GH. You can find videos to walk you through this on youtube. I would use 1cc of bac water per 10iu vial of gh. Then every 1/10cc will be 1iu. Dosing will depend on how much you want to invest into your gh cycle. 2iu would be the least I would use, taken every day, or at least 5 days a wk. Also, as you will see when you do more reading in the GH section of the QA, you do best to use this with a steroid cycle. 

So 2 iu will help with fat loss and some muscle gains but the gain will not be dramatic. More gh will help with muscle gain as long as you are using a cycke with it. 4-5iu would be a hefty dose. Believe me, there are guys that use much more, but I would start lower and see how you do and then increase as you want to. Just rememeber. This is a long term thing. So you want to run it for at least several months. Ideally stay on it longer. The longer the better. So 2-3iu for a year is better than 5-6 for a few months

Also, you use an insulin pin. I would suggest putting it into any lean muscle, like delts