http://www.flashgamelicense.com/ provides a hub for people looking to license their flash games. check out the forums. http://forums.indiegamer.com/ is also recommended
in general ad-only revenue by itself doesn’t generate a lot of money. depending on the game, sponsorships, premium (download or mobile) versions, in-game transactions etc can be more lucrative.
if you are planning on making a living / supplemental income from your games then i’d do a bit of research on where the demand is appropriate to your skills – and take advantage of the sites above to review your game(s) and get feedback.