yes you can but you need at the leaflets and in the right box. You can sell them at Block Busters as well!!
Yes, you can sell videogames to GameStop, but, they do not give you money in return, unlike Game Crazy.
Depends on what types of games. Most games they can buy from you, but in my opinion, the offers are not very good
Try online auction sites such as Ebay or Craiglist. Or try a local retro games store near you. use the yellow pages to find one
You just go to the store and say I want to sell my game (like i did in gamestop)