I would recommend at your age holding out on juice until a year or two of hard training and dietting. Can I suggest heading to the diet section and having a chat with '3J', his the bomb at diets and nutrition man. I personally use him and his service is A1 bro.
If you get on board with him you won't need juice, juice you need to have a good diet to start with in the first place otherwise it's a waste of time, money and could cause harm to your body if not researched properly. It's just a suggestion...
When you decide to cycle, I would honestly go with 500mg a week of test prop for 12 weeks, pin EOD. Mon, wed, fri, sun, tues, thurs, sat etc etc.
2 weeks after your last pin take 50mg of clomid a day for 4 weeks, and Nolva 40mg a day for 2 weeks then go to 20mg a day for last w weeks of post cycle therapy (pct). That would be my suggestion to you man. Get as much as you can naturally, once you've hit your peak consider.. Don't jump into but consider... Riding the roid wagon. It's not a game that needs to be played lightly champ. Alot of health issues at stake, that can cover the rest of your life.
I hope i helped with your issue man, if not keep asking what you need to know. More than happy to help. We've all been at the stage of learning... And we all still are.