D.B.
Depends on what you are good at but have your own online business. If you are good at design, start your own t-shirt company (no inventory costs you just get paid when soemone orders your design), sell your famous cookies on ebay or start a newsletter and sell the advertising space to Google (they do all the work).
To get started get educated. Read the most definitive guide to having your own online business called "$500 Startup". It's easy to read and shows how anyone can do it. You can get the book for free by going to the book's website (free for a limited time www.500DollarStartup.com ) plus tutorial videos, audios, etc... I suggest you kick the tires before you buy their advanced system but either way Totally worth it.