Get a job.
Echoing what Dave said, the craft is not really the difficult part of this business, it's the business. If you're thinking of doing sound design for longer as your main pursuit, then you need to find someone or something that's willing to pay for your services and continue to look for opportunities, because many projects are temporary. I.e. you need to find a way that enables you to do sound design for others. You can look for positions in established studios (unlikely), look for gigs as a freelancer (difficult, but the most usual option), look for positions in media companies (the most secure/profitable, but usually loads of equally good applicants and very few positions) or just work on sound on the side while doing something else to get food on the table.
Also, you need to create a presence (in the public, in the web, among your friends). You need to get your voice out there that says "I'm a sound guy, I can do sound for your project!". That's a start into making yourself a person that people who need sound design services start to contact.
Also, when you start to do projects with/for others: always do your best work, always give the best service that you can. Your reputation will be built on how good work you do and how easy or fun you're to work with. Remember that there's nothing more to your work than how good it sounds, was it delivered on time and on budget and how easy you were to work with, that's what generally matters to the clients.
Good luck.
Edit:
Also, build a portfolio from the work that you've done and put it in the web. Keep updating it when new work gets done. The portfolio is what you use to sell your services to people or what a prospective employer will be interested in.
