The answer to all of it is , yes you can do it. May not make the most sense, but it sounds like you're at a point you're going to dive in. So that being said, I'll tell you what I'd do.
Personally not a fan of the n2guard or any N2 products. So you're using it now, fine. But if you're needing to get another bottle for an extended run, grab some Ar1macarePro by OL or CEL Cycle Assist.
Stop everything but the Epi once you start the Test, and treat it like the kicker to your cycle. Four weeks.
Since that totals 8 weeks I wouldn't finish the cycle with another oral.
Mast is great. I love it. But I would start it at the same time as your Test and run it throughout. It's a great strength and aggression boost. Keeps estrogen down, libido highER, and as long as you're ok with the sides associated with heavy dht compounds, then it doesn't really cause any additional complications to a cycle.
That's all I would run. Perhaps finish the last 4 weeks with Test at 750 (and upped AI).
I'll just say it. You're 22. Be ready to say goodbye to your normal life already. Very hard to go back once this begins. It's going to get you some great results. Nothing will ever live up to it after this. Be responsible and exhibit moderation and they are fine.