http://www.ironmagazineforums.com/anabolic-zone/104658-first-cycle-pct.html
Don't use HCG or nolvadex for PCT. You use HCG+AI on cycle and AI+Clomid or Torem for PCT.
HCG keeps your testicles happy making PCT smoother and dosage is dependent on how suppressive your cycle is.
HCG isn't needed but then again, keeping all your newly gained weight after you stop your cycle isn't "needed" either. HCG increases your chances of maintaining your new mass by kickstarting your own body's test production.
You'll notice that people who know wtf they're doing on this board keep all the mass they gain (unless you're well beyond genetic potential) while uninformed/ignorant people will tell you that your gains disappear once you stop cycling. It's because people on this board understand PCT while others don't and just lose all their hard work.