One option is to use
modelcentro as you can have your own site they deal with hosting and billing and everything. They also have a good version of onlyfans.
For each model you need ID and a model release.
This is not 2005 when you could make a film and it would sell, it is not that easy.
$500 is not much unless your going to do a solo model shoot.
If I was going to give anyone a tip for starting out from brand new in 2023 it would be do something amazing.
Pornhub is a site that will get you lots of views as people are after free content. How many will result in sales from a single film, may be low.