CDBaby's founder, Derek Sivers, has an excellent blog post on how he started sharing and making money by sharing the things he was interested in. He outlines three steps:
You already have something of value that you want to share.
Find a way to share it with everyone who needs it.
If it takes a bit of effort to share, feel free to charge a little for your effort.
Assuming you have something of value to share... Sivers is basically saying that "Step 2" is just to find a way to share!