Aside from wanting my personal favorite fantasies produced first
...it might be good to talk to people in the industry who are frustrated producing the same formulaic products. People wanting to break out and do something independent are more willing to sacrifice (at first) to see their vision realized. That would make it more possible to get started on a shoestring budget. "Different" would also give your production company a ready identity.
But there are financial reasons why formulas
become formulas. Story is half the market appeal--actress is the other. I'm still not interested in my favorite genre if the girl is not appealing to me. So you'd be a fool
not to re-do a successful story several times using actresses with different visual appeals.
I'd say start by reading any book on or by
Roger Corman and how he started a film company from nothing, then transfer his successful ideas to what you learn about JAV. Corman knew his movies would be shown at drive-in theaters, so he started with a list of titles--no stories, just the titles--that would fit on the marquee and have instant appeal to drive-in patrons. IIRC, the story is that when Ron Howard first wanted to direct, Corman handed him only a title "Grand Theft Auto" and said, "Make this movie--and you have to star in it for no pay. If it's profitable, then I'll let you direct another movie."
For sure, that first movie has to generate profit immediately. I imagine title & cover is today's equivalent of Corman's drive-in theater marquee. Absolute minimum production costs, and being able to demonstrate that to potential investors is a must. In America, we call it
sweat equity. (I think the definition of
sweat equity in porn is using your own camera & cock, and your getting your girlfriend to star in it.) Determine how much you provide on your own at no cost other than time.
Also, that first movie has to attract broad interest from people who
purchase their films--but still standing out from the familiar formulas. Maybe start your research with which movies (genre)
sell the most, then imagine a way to put a new twist on that. I'd look to make that twist something that appeals to the audience of the
second or
third best selling genres.