I'm going through exactly the same thing you are right now- there are extremely limited resources for movie theater business plans. However, the closest thing I've found is this:
http://www.125aday.com/books/229/business-plan-movie-theater.cfm
It's still fairly generic, but at least it provides you a template to just change what is already there. The included spreadsheet is worth the price itself. We still have to do the legwork like finding out how much concessions cost, estimate electricity, figure out how much to pay employees, etc., which for me, is definitely the hardest part. The people on this forum ARE the best for help, but for whatever reason, posting exact prices seems to be taboo. Calling suppliers and posing as an already established theater owner is the only way I've been able to get pricing.
I'm combining this with software called Business Plan Pro 2004 from Palo Alto Software and between the two, we can come up with a killer business plan.
You'll also need to find a CPA or accountant to get information on taxes, determining what type of corporation to set up, payroll, etc. It's frustrating because we're trying to get money for a theater, but in order to even get started, it takes money! Classic catch-22 situation. I guess that's why credit cards were invented.
I've been told that I'm being too picky on pricing. I'm trying to calculate everything, down to the price of hand soap and vacuum cleaner bags, but I think a more generic cost might be sufficient for the banks. Maybe someone who has gone through this already has some advice on this?