you don't know what you are talking about kiddo.. unless you are born into wealth and only want to do this for fun.. you don't want to be a professional bodybuilder, it is not a way to make money.
there are 400 or so IFBB pros, and very few of those are able to make money through bodybuilding.. so they do things that are morally and ethically questionable to finance their drug usage. It is a very unrewarding lifestyle and it is extremely bad for your health..they are on a slew of medications to keep their health somewhat decent, and have regular trips to the doctor (I read jay goes once a week or every other week).
Most of them are completely piss broke and live in tiny apartments.. only the best of the best make it, and the rest fade into oblivion.
you are 19 and wanting to know about your first ph cycle? the top pros have already been on for over a year at your age.. you are already light years behind where you need to be.
there is no edge in bodybuilding.. everyone is on everything as far as they can afford. IFBB bodybuilding is the one sport where it's impossible to cheat..
having said that.. you will need nolvadex or clomid for pct, 20mg ED of methylstenbolone should be quite potent.. though I would suggest running real gear but you seem to be opposed to that at this point.
pct nolva 40/40/20/20
or clomid 100/100/50/50
if you have really been researching for 6 months.. you should know all of this and more already..