If you have been taking photographs for a while than you already have a small library of photos built up. Once you are ready you need to go out and find new subjects and take quality photographs, and keep building your library. You will also need to do a search on a search engine such as google for stock photography. There are a lot of good micro stock sites out there I belong to one called fotolia.com.
Now you have a website picked out and your library ready to upload. After you create an account with your user name and password you will need to upload your photographs to the website for review. Once your photographs are on the site they have inspectors look over the pictures for aesthetic quality. The photos that they feel are of good quality they will approve and will be ready for sale. This process can take a couple of days to a couple of weeks so you will need to use patience here, time to snap some more pictures. Just because you are waiting on approval of one batch of pictures does not mean you can not upload more keep snapping and uploading.
Do not get discouraged that some of your photographs are rejected happens to everyone. The more you submit the more will get accepted, but only put on your best photographs. If you submit a large batch with a couple of good ones and a bunch of bad ones chances are they all will be rejected. If the inspector looks at 3 or 4 of them and thinks they are bad they will think the whole batch is bad. Keywords are key to being successful you need to think of anything this picture could be used for, represent, or any other reason people would buy it.
You now have your first photographs submitted, keywords, and accepted now is the waiting period. This can take a very long time before you get the first sale don’t worry this is normal. If you get sales in your first year you are doing good. Keep snapping, submitting, and start linking your stock page on other web sites. Use social networking sites to get your name out there and let people know you have a stock library. Get in with some graphic design groups and other visual artist that may need your work. After a lot of hard work and patience you will start collecting sales while you are on vacation or watching a movie.
Good Luck and Thanks for Reading