Can anyone give some good hints about how to making money with parked domains and whom should I use? (ex. sedo, afternic etc) How can I get back links for parked domains so that I may increase my PR?
Use a few different sites and see which one makes the most Sedo tends to pay low but is good for selling names. When you park your names they dont want you to send traffic they want it to by "type-in" or from search engines.
If your portfolio is small, Sedo is your best bet. However, Sedo's problem is that it requires 2 clicks to earn $ (1= click on the category; 2= click on the link; then you earn $$). Every extra step diminishes the CTR. Google has an excellent program, but you've got to have a large portfolio: http://www.google.com/domainpark