1- There aren't that many adult industry attorneys, and only a handful to be highly recommended. You may want to consider JD Odenberger of
http://xxxlaw.net/, I believe he's in the Chicago, IL area.
2- I would get one form per model per shoot. The forms always have a date on them and are specific to the shoot.
3- You may want to try CCBill, since a lot of other solo girl sites also use them.
Of course, there's a million other issues, like whether the girl is hot enough and has enough personality and also how you plan to generate traffic and your tour and lots of other things, so good luck with your project.