Freelance Web Designing

I’ve been designing websites for myself and friends for a while, now I’m getting requests to do it for small businesses and churches. What is the process to get started? I mean, the people I’ve designed for usually have their own web page somewhere. I was told that I should contact a local webhosting company and ask them if I can by some space on their server. Will I be able to administer 3 or more sites from that standpoint? Should I have the client register their own domain, subscribe to a web host and then give me their account info? How can I do this seamlessly?

Help!