I personally like Nolva or Arimidex on cycle for Estrogen. Prami for prolactin, and Clomid at 100 first 3 days then 50 ED after that + natty test booster and cortisol suppressor for 4 weeks of PCT.
I honestly do not think there is a set length you need to run a PCT at, for me 4 weeks seems to be the sweet spot, but if it takes longer than that for me to feel back to normal, I will stay on PCT until I feel normal again.
It might be smart to run some hCG if you can get your hands on it during your cycle. Most around here recommend 500 IU a week injected at 250IUs twice a week. I would say to start that around week 5 or so and run it all the way up until PCT. Also remember that deca takes a couple weeks to clear the system so after your last injection wait at least a week until you start your PCT, but during this time after your last shot, continue running the hCG until you begin your Clomid regimen.