Hi Emmeline and welcome to saafe.
Like the others have said, firstly read the main site three or four times minimum as you will take in something different each time you read it. There is a lot to take in so you won't remember half of it but it is always there for referral, even after you've been whoring for years you will need to refer to it.
Your size and tats will not be a problem, they will just draw the type of guy who likes either or both.
There is work for everyone in this industry, even oldies like me, though I've retired for whoring now. Please don't go by what agencies have as criteria as they have a very limited view of what a female worker should look like.
I would also forget about agencies period. You will do much better if you go indie and get yourself out there with your own profile and website and you will keep 100% of the money too and not have to hand over 30-40% of your hard earned money. Like xw5 says, you can control your profile better yourself and screen the guys you may choose to meet and remember, you don't need to be willing to see everyone who calls or emails you. Who you see is up to you, unlike a lot of agencies. Agencies, won't vet clients as well as you will so you just don't know with them who you are meeting. That is never good.
Take your time with getting set up and read read read read read everything you can. Even all the threads in this forum. It's amazing the things we don't think about before we start.
Jan and Feb are usually quieter months due to guys having to pay off those credits card bills and get back on their feet so there is really no rush.
All the best.