also where do you get your work, is it mainly from AW? I'm keen to learn but I wonder how much work is out there for this, considering you're only going half way (iyswim). So do you do escorting as well for the pennies?
This is coming from someone who does full-service (GFE) escorting, which includes a few massages but usually more, so feel free to take with a pinch of salt

but I think there are certain important trends in the sex industry right now, particularly areas that are close to each other (erotic massage and escorting aren't that far apart in the grand scheme, compared to starring in porn movies or working in a strip club etc).
For example, this industry has never been the license to print money (phrase shamelessly nicked from Amy

) that some inexperienced/naive people might assume, and it is even less so now that the recession has hit and certain prices go madly lower while more and more newbies take up sex work. This all sounds rather depressing but it doesn't mean that a determined, patient, smart person can't still make a good living in the biz - it just means you might need to be a little more determined, patient and smart than you might've had to five or ten years ago.
So I think a good piece of advice for anyone entering the industry - no matter what precise type of work they plan on doing - is to take it slowly. If it's at all possible, retain (or start) a possible second income at least for the initial phase. Any newbie who wants to work independently (there are massage-only parlours, but you'll have to rummage through lots of punter forums and review sites to find 'em) could be looking at 2-4 weeks of annoying phonecalls, pointless emails and creepy timewasters before they get their first booking set up; maybe even longer. This is good because it means you get plenty of time to learn how to listen to your gut and assess potential weirdos and timewasters over the phone and by email - these are all lessons you'll need to learn ASAP - but it's really ideal that you not be facing eviction if you don't earn ?400 by next week, even though that is probably the #1 time that most of us start this job in reality.
Basically, it's a good idea to set up a free profile on Adultwork, and maybe an affordable basic website for Punternet/Punterlink etc, and then spend a few weeks tinkering and tailoring your advertising until you find yourself getting a good number of genuine inquiries. You'll get plenty of practice dealing with annoying wankers that way, too!

You'll also have plenty of time to get your security sorted (ideally, you'll have a buddy who works in the same area with similar hours, so you can do security for each other - but the most important thing is to never be alone with a client without
someone that you trust knowing where you are and what time you should be finished) as well as sorting out clothing/lingerie, massage table, toys, lube, condoms, whichever sex work equipment is most applicable to the appointments you'll be offering.
So, taking time is good, and basically, the only way to learn the precise answer to, "If I live in x town and do abc advertising and am available y hours and do(n't do) incalls only, how many clients will I get?" is to do some free/cheap experimenting yourself. We all run our businesses in very unique and personal ways so we can hardly ever give detailed advice on what to expect - well, beyond, "Clients and sexual services", anyway!