Hi! I disagree that article spinning is the best way to earn some cash with articles. For some, it might be so, but many people are looking for writers capable of delivering creative content. Deadlines are also important. I suggest that you browse some freelance web pages and look at some job offers. Familiarize yourself with the requirements and start practicing.
Also, read everything about SEO writing that you can find in this forum. Articles on all kinds of topics are needed, but what's important here, is the right density of the keywords you use.
Good Luck