Hi mate
It's a bank holiday weekend in the UK and not sure about the States. Hold out until Monday or Tuesday and I'm sure you'll get loads of solid advice from the guys.
If you haven't done an injectable cycle before, you might want to consider a longer acting testosterone like Cypionate or Enanthate for your first cycle. Plus, while I have no problems with Propionate, some guys suffer from a fair bit of pip (pain) from Propionate.
If you do go for the Propionate cycle you're going to have to inject every few days at the least to get and keep blood levels stable.
As for the Masteron...It comes in Propionate and Enanthate forms. You need to establish which one he's got for you. Masteron Propionate - like Testosterone Propionate - has to be injected more frequently than Masteron Enanthate. Basically, if you do run Testosterone Propionate, it might make sense to run Masteron Propionate along with it.
Doseage wise? I'll let the others advise on that issue.
On Cycle Therapy should include some form of anti-E. Okay, Masteron doesn't aromatise and it helps control E conversion to some extent too. However, I wouldn't advise running it without some other proper anti-aromatiser either on hand or actually from start to finish of the cycle (arimidex, Aromasin, or Forma Stanzol). Also, don't forget, that Masteron is very androgenic. So if you're susceptible to acne, hair loss, and greasy skin, aggressiveness etc., you might want to keep this in mind. I personally, love Masteron and have no such issues with it, but some do.
Finally. If your body fat is quite high and you're using it in the hope that it will burn the fat off, you will be disappointed. It does enhance vascularity well, if you're not fat but not ripped, and it will dry the water out from your tissues, but it will not bring about drastic results in fat burning. Just have realistic expectations from it and you will be pleased. I found it was great for increasing strength in workouts among other positive points of Masteron.
Enjoy the cycle if you go for it. Let the experts chime in first though, before you go head long into this one. Your first cycle should be a very positive experience, so listen to them who will know best.
Craig