Free site question
 

One of my friends ask me something about doing free sites and post to link list sites, because I never did free sites and actually I am not in adult business a while, so I am here to ask help.

1) Which link site(s) you think worth to submit to, and
2) If keeping submit 1-2 sites everyday to some 10 link sites, how much expecting in return($) each month?

Thank you!