I advise you give yourself a few more years to find out what kind of size you can put on. You are still a teenager, and at your age haven’t even matured fully into a man.
250mg of sostenon per week is very comparable to testosterone replacement therapy. It will shut you down, but size increases will be poor. Don’t confuse water retention with size.
You would need to do twice as much to get any benifit.
Furthermore your pct is spotty at best. The clomid will be wasted, as the first 10 days you will be nowhere near ready to recover your normal hpta function anyways.
Do you really want to be 18 and the only boy who can get it up? That can be quite a tramatic experience at your age.
Finally you are entering the prime years of your life. I advise strongly that your learn to listen to what your body is telling you above all else. Lift to avoid injuries, as that is how you grow, provide that your diet is on point. Steroids now will rob you of this great opportuinity.
I will honestly say, that the money you spend on AAS right now, will be better put to use by employing a very knowlegeable trainer, and diet guru.
Search for one in bodybuilding circles, as their knowledge at your age can make a huge difference. I guarentee if you do so you stand to still put on a lot of size naturally.
I sincerely hope you take my advice into consideration.