Minx, I'm worried that you're going to fast.
Your first post was a "I have no idea what to do please give me advice" one*, and it was just yesterday. I don't think you've had enough time to get to a point where you know what you're doing, and while you can learn by stumbling about, it's not a safe way to enter the industry.
Horrible people prey on clueless newbies because they know they're likely to be easy to manipulate and not necessarily good at looking after themselves, so you need to be tough and smart enough to deal with them. Also, one of the tactics that horrible people use to get their way is to blind you with the promise of cash. Requests for overnights and multi-day bookings often come from timewasters, scammers and abusers, because they know you won't want to turn down ?1k or whatever they say you'll give you. I know it's hard to do, but I suggest you say no to tonight's booking, step back from trying to get any work at all, and give yourself at least a week to learn about the industry, process what you've learned, and think about how you're going to keep yourself safe and sane.
*If anyone's wondering, it was posted as a reply to a thread in the articles board. It didn't seem worth splitting and moving it here because it just needed the standard responses of "read the main site" and "we don't recommend agencies", so I removed the post and responded by PM.