I'm not sure I like the timing on the Drol. 3 wks will be enough to make some changes, but why not kick start the cycle with it? Then add the tren in wk 3 as planned? This way, your cycle will start out strong. You'll add a solid amount of fluid, while you wait for your test to kick in. I would also use an AI through the cycle, at a low dose and follow it up with a solid PCT. I find that tren can be harder to recover from, so at your age, it may be worth adding in some HCG, 250iu 2x wk, through the cycle.
I would excpect to get very strong on this cycle. Be careful!