There is lots of information about escorting on the main site here: http://www.saafe.info/ - have a read through the different sections as virtually everything you could want to know is covered, although it is written very much from the independent point of view. Anika Mae has written a really comprehensive post on choosing agencies here: http://www.saafe.info/main/index.php?topic=385.0, although there clearly needs to be a way of making it flash bright green or some such, as nobody posting lately seems to paying much attention to it.
If you are really struggling with getting started, the best thing to do is get in touch with Penny and arrange a buddy through her Buddy Scheme - this will be an experienced lady who can help you with your questions and offer support, although I don't know how many agency girls she has on board. Hope this helps! x