LÖVE

If you make a game, and finished who/how do you sell it?

Any way you can. Make a website and accept payments through Paypal or something. Get it on Steam or the Android market. Sell it to a publisher (not recommended). Make it free and ask for donations. Using Love doesn't have anything to do with selling your work.

I recommend amazon payments if you want to sell something on your own website (thats how I do it). Amazon has some pretty cool options and Paypal isn't particularly professional looking.
Desura is very indie friendly and it's quite easy to put a game on Android or XBLA.
If you're wondering about the legal side of things you'll have to read up on some licenses, but for the most part you can do whatever you want with Löve.