|F. Scott Fitzgerald wrote and sold short stories|
to pay for his and Zelda's extravagant lifestyle.
This is a tough market to break into. As with all markets there is a sliding scale of pay rates: magazines like the New Yorker pay a months rent or more for a story, while many webzines pay nothing. If you write short stories, a good directory to find stats on a huge variety of magazines is Duotropes Digest. You can search by pay rate, genre, and story length as well as other parameters.
As with any writing job, the key is being able to write grammatically sound sentences and perseverance. You will be rejected. The trauma of your teenage years is nothing compared to the countless rejections you will receive. Because so many rejections are sent out, most magazines employ a standard rejection. When editors receive more promising stories that they are still going to reject, they often add a personal touch to encourage you to submit in the future. A strange thing happens, where you begin analysing your rejections for even the slightest hint of a human behind the email. In the past, when the Internet was still a science fiction fantasy, writers use their rejection slips to devious ends. Some even papered their bathrooms with the slips!
A good idea is to join a writer's group. You can support each other when you get rejected, and help each other to improve your writing skills. You'll also make some writer friends who you can discuss literary gossip with!