The best thing to do is probably advertise yourself on forums. Most php orientated forums have a freelancer section where you can post your skills and availability. Someone will then contact you with an offer. This sort of business is tough, but with the right promotion you will get the clients. And if you're in the UK close to the north east then i may have a job for you if not then keep trying. Create a portfolio showcasing your work, and maybe start a few small projects of your own. When i first started i was making template engines and database wrappers.