since you say you're interested in competing, i assume you are trying to put your contest cycle together? thats the direction i am going to go with my reply. if this is not the case, and you're still in the off season, looking to gain more mass, focus on anabolics like test/deca or EQ/dbol. no need to do anything too exotic in the off season.

now, on to contest cycles. there are a lot of ways do run gear and i have my own opinions, just like anyone else, but of course you can put things together in various ways and still get results. that being said, there are some basic ideas about building a contest cycle that are pretty well accepted. if you're going to use primo, i would certainly reccomend the injectable version. the tabs are very very weak and are pretty much a waste of time. personally, i wouldn't even suggest them to females. as for dose, i would run it as high as you can afford. it's hard to be very specific about dosing since i dont know how much you've used in the past and what your standard doses have been, but i would run primo at least at 600mg EW. 800mg if you can. i would run it all the way through a 16 wk contest diet, right up to the show. for your test, you can use a long acting test all the way in, but you will need to increase your AI if you do so. it's not at all uncommon to require 1mg ED or more adex to get your water retention low enough. if you would rather not go that route, you can swap the long acting test for test prop at 6 wks out. just be sure to keep the MGs close to the same. so if you were running 750mg test e EW, at 6 wks out, you would want to go to around 100mg ED prop. at 6 to 4 wks out, you can begin the winny. personally, i have always used the tabs after having some bad expereinces with water based injectables.you can start that at 50mg and in the last 10 days, i would up it to around 70mg. another great hardener that the majority of competitors use is tren. IME, a little goes a long way. if you were to also begin that at 6 wks out, even at a low dose of 50mg EOD, it will help you come in crisp. 

you'll also need to look into water manipulation and possibly a diuretic. i prefer a potassium sparing diuretic over a loop. you need to spend time understanding how they work and how to dose each one. it should be for nothing more than the final touch. if you over do them, you can end up in the hosptial or worse. they are a part of the game but you need to be very careful and respect what they can do,