I recently had been contacted by a client thru Philweavers - try to register there too. Charging clients is a little bit tricky. You can charge per projec or per hour. I prefer hourly rates because there is less pressure - you don't get paid unless you work.

I am assuming that you have a steady dayjob. So charge you're client to what _you_ think is worth your extra/rest time. And don't overdo this :P spend some time for yourself -- hack a pet project or learn something new :P Once you get into it, it's hard to back out :(