A lot of men's physique guys stay natural in the offseason and just run a short 8 week oral cycle before their competition to dry and harden up their physique. You don't need a huge amount of muscle for men's physique. You just need a good V taper, fantastic abs and a nice chest, shoulders and arms.
I would keep things really simple and run an anavar and winstrol cycle 8 weeks out from your show, followed by a mini PCT after. Time the cycle so that the last day of your cycle is your competition. They day after your competition, start the mini PCT.
I explain how to safely run the cycle in this video here:
https://www.youtube.com/watch?v=5DBrylerLxA
It looks like this:
Weeks 1 - 8
Winstrol 50mg/day
Anavar 50mg/day
A good natural liver aid supplement like N2guard - 1 serving/day
A good natural testosterone booster like HCGenerate - 1 serving/day
After the cycle, it's important to run a proper mini PCT to restore natural testosterone production.
4 weeks of the following:
clomid at 25mg/day
nolvadex at 20mg/day
A good natural liver aid supplement like N2guard - 1 serving/day
A good natural testosterone booster like HCGenerate ES - 1 serving/day