Test E 300mg+Hgh 10iu cycle at 16

I am planning to start my first Testosterone Cycle with 300 mg‘s of Test E. I am currently 16 years old 183cm Tall and weigh around 71kg . I’m planning to stay on it for 12-16 weeks while pinning weekly. I will regularly get my bloods done to see what is lacking and if I am going to need an Ai (in my case arimidex). I’m thinking about hopping on Hgh beforehand to get used to pinning etc. If anyone has a better idea or has some important advise that I’m gonna need to know please let me know!