Nolvadex is for gyno, which you may experience with the sust.
I have run it for a whole cycle, but now, I simply wait and if symptoms appeare, soreness, swelling etc then I start with 20 mg per day go to 10mg per day until symptoms are gone and like the other post said, post cycle you want something to restore your natural test and help keep your gains, clomid is popular, others (myself) use HCG and primo.