Hi Syed,
I'm new to buying and selling domains but can share my experience thus far. Currently all of the domains I'd like to sell are listed on Sedo. I listed them about a month ago and parked them with Sedo as well. In the first 3 weeks I had roughly 10 total visitors with no offer views. They were all listed at fixed, very reasonable prices. I figured if it wasn't working I needed to change something, so about a week ago I changed them all to 'Make offer' with no set price. Since making the change I've seen a considerable increase in page and offer views... and today I received my first inquiry via email regarding one of my domains.
I've also sold a handful of domains on Flippa but think I could have got more from them if they hadn't gone to auction. For me, Flippa is good when I want to just get rid of a domain, or if I get a wild hair up my ass and just want the excitement of having a domain on auction (one of my lower valued assets). My domains listed so far are mostly hand-registered, two-word combos.
Good luck to us!