My first advice to you would have been to not start the cycle. Too late for that. I saw you posted that you have done tons of research. It looks to me as if you did no research at all. I am not bashing you, but I am just stating a point. When you are putting Testosterone into your body and you state you are just putting in 1cc and that is all you know, that is very scary and let's me know you are not prepared for a cycle. You should have never started the cycle. You have no clue about the HCG and you are asking about what post cycle therapy (pct) you should take. Rule of thumb is to never start a cycle without having all the necessary items on hand, i.e (post cycle therapy (pct), Aromatase inhibitor (AI), Human Chorionic Gonadotropin (HCG), etc.)
Besides all of that, 21 is too young to cycle. I would wait at least until 23-24 at the earliest. I started cycling young and now I am on testosterone replacement therapy (TRT) (Testosterone Replacement Therapy) for life. You can put all the compounds into your body that you want, but you will be amazed at what training and diet will do. Stay around awhile, hit up the Diet and Training forum and learn as much as you can. Later on you will look back at this post and laugh after you have been around here for awhile.
By the way 1ml = 1CC. So 250MG/10ml bottle is 250mg/ml. Therefore 2cc's would be 500mg. Best of luck. Welcome to Ology!!
But to answer your question, I would run 500mg/wk with injections on Mon, Thursday.