Hi Lenne,
I'm not a BBW myself, but I know that they get plenty of work, and I believe the clients vary as much as anyone's. You should have a look at Pretty Big Escorts if you haven't already. It's run by Brandy especially for BBWs and the men who lust after them.
Are wondering about how safe your details are with Adultwork, or how safe the punters there are? I haven't heard anything about information getting into the wrong hands from there, but you don't need to give them anything sensitive anyway. If you haven't already, get yourself a prepay phone and a new email address to use for work, then use those details to sign up for work stuff. As for the work you find, it's as good as you make it. There are some good guys using the site and some dodgy ones so you need to have your head screwed on right. AW makes it particularly easy to find new profiles, and some people will use that feature to prey on new girls. Read the articles on the main site here and look through to forum, so you know the kind of tricks they try to pull. Work out your limits and what you'll do to keep yourself safe, and never compromise on them. If something sounds really good, assume there's a catch. You might also want to sign up for Penny's Buddy System so you have someone more experienced to look out for you.