I know who've worked in comics and Hollywood have told me it was a lot easier to sell their first tv or film script than their first comic script. There is just about no chance for someone without atrack record of published work to break in as a writer without having a close friend in a position to hire you. This means you'll have to move to NYC or CA and take a job that won't pay you enough to live there. Or, and this is the recommended option, start writing small press comics.
Self published minis are a good start.
Make friends with artists with tastes similar to yours. Get them to illustrate your stories. Send the stories out as samples. You can meet artists at local cons, art schools, coffee shops and, of course, comic stores. Publish your own work.