This is a controversial approach but the only reason I got started was selling through microstock sites. There is very intense debate as to wether they harm the business but it's an excellent way to start out.
It's worth taking a look, I havn't uploaded any images in 3 years and I still receive a regular payout from what are quite frankly poor images, some links
here.
I should say I only ever uploaded 'disposable' images to microstock.