Some weird advice here.
First, yes photographers will photograph you for free, but they will also use the pictures for their own benefit - something you do NOT want.
I wouldn't recommend partnering with any of the other sites either that have other girls. Do it yourself; own the site yourself. It's not difficult to do. I ran my own site for three years with the help of one person.
Financially, yes you COULD get by for real cheap, but I'd suggest somewhere in the neighborhood of $7500. 2 to 3 thousand to build the site, a thousand for camera/video cameras, start at about a thousand for hosting, and the rest for advertising (30 for hosting gets you a starter site, but the goal is to quickly build your traffic).
Hope that helps, and I have other suggestions.
If you want email me at whatchathink24 at yahoo dot com