I've done two week tren only cycles - which i've done a couple of times to finish ofF some spare tren lying around.
Tren is really powerful in shutting you down, however, for me it's the only drug that has ever done that on two week cycles so i use HCG throughout. It keeps my balls working and testosterone levels up.
Always use an AI - i find light daily doses of letro tapering up and then tapering down works well (i taper up and down because i've found in the past coming off letro too soon causes estrogen rebound).
When you go off the cycle, use a light dose of a SERM to get your endo test levels running high again, like 50mg clomid or the equivalent nolva. I normally run these about five days after coming off the tren - i don't like being on SERMS too long because they generally turn me into an emotional little bitch and aggrevate acne.
At your age, if you want to play about with these things, i'd try very light cycles, because your own endocrine system is still maturing. You don't want to damage it too much too soon, so something like a couple of 2on/4off cycles of tren (with a protocol outline above) will be a great cycle for someone at your age - just don't abuse tren, it's a VERY powerful substance.