The best way to make money off something is to sell it.
The best way to sell it is to make people want to buy it.
To make people want to buy it they have to A) Know it exists, B) Want it, C) Afford it, and D) Be able to buy it.
A) Can be done anywhere. The effectiveness depends on where. Steam is good.
B) Is the hard part. This is part of programming.
C) Is simple. If you don't go crazy, then it will be fine.
D) Is technical. You either need a portal (Steam, Desura etc.) or to do a lot of web & database programming etc.