i need some help (legal)

ok here's the deal...

last summer we hired 19 girls, and have an hours worth of footage from each girl.. we made them sign a contract stating the pictures/movies will be used on the net, porn based sites, and will also be sold to other webmasters

we also photocopied the drivers license for age..

we broke down the video footage into sets of 150 pictures.

I need to know what to do from here.. how/where do i obtain a copyright on these pictures and movies?
Wheres a good place to look for a lawyer that deals in porn related stuff?
What prices will i be looking at for copyrights? and how do i license the material to other webmasters?

im totally new at all this..

can anyone help?
free info would be great, but if it comes to it, i'm willing to pay a consulting fee. I just don't know where to go from here. I already have 12 girls lined up for more photoshoots but i don't want to invest the money in them just yet until i get this all figured out!

so um, help pleeze?