I can tell you right now that you are not even nearly ready to use gear.
I don't care who you are, but absolutely no one will gain anything close to what you are wanting. Plus, when you do a PROPER cycle you WILL gain fat and fluid and still wont get 20+ lbs out of it. You seem to think that steroids are as magigal as media makes them out to be, but after you jump into it (and i know you will) you will see that this is not the case. It's very true that you can gain a lot quality muscle on gear, but you WILL get side effects and you wont gain much of anything out of 300 mg of primo. You might look a little better, but that's it.
I know i sounded harsh, but you do need a reality check.