well hcg, you can either run it at a low dose like 250mcg's 2x's a week through your cycle. Or you can dose it high like 500mcg's EOD for the last 2 weeks. Some people even like it during PCT. you might want to look up swales protocol and go from there. Seems to be tons of views and oppinions on how to utilize hcg.
Your english is cool. You might want to go more then 3 weeks also, not neccesarily with serm though.
Check some post by Dr D in this section. particularly the running ATd inverse to serm there are some excellent post cycle layouts there.