It all depends on where you want to take it, how much time you want to eventually put into it, and what other skills you do or do not want to have to learn along the way. A blog is a good next step if you want to keep it kind of on the hobby level, unless you have a good monetization strategy and want to learn quite a bit or marketing.
If you really want to develop it into a career, there are two logical options at this point. One, go the freelancing route -- hit the freelance marketplaces (my favorite is Elance, but Guru and oDesk are pretty good too) and start working job-to-job. Not a bad way to go, that's where I've been full-time for five years, but am now trying to work into the second logical option. That second option is information products (I'm currently working on an eBook for an introductory, and a full training program after that). This takes a lot more background education, but it also has much better earnings potential. The person who has been teaching me some of the additional skills I need has made $100 million on information products now -- while those results probably aren't typical, I know hundreds of people who are making a tidy living with it. It basically just starts with having some knowledge, and finding out who wants it.
Stand by -- I feel a full hub coming on.