There are lots of online income to be found in online writing. Personally I stick with the AD revenue work as the pay can be more in the long run, but there is also a large advantage to taking on jobs that pay per article completed. These jobs usually pay right after the job is accepted. Pay depends on the experience of the writer. Newbies or beginner writer usually get around $15 per page while an expert can get paid three times. All writers will have to start at the bottom and work their way up to the top. As with finding any online income there is a lot of researching in finding the right writing job for you.
These sites are some great resoucres for find more freelance jobs for writers:
Online Writing Jobs