You can set up a website with paid content, and you can find many examples of such websites on the Internet.
But you wouldn't be able to set up and operate such a website from Bulgaria because of the law there. You probably need to find partners in another country, where such a website can be set up and operated legally.
Also, it probably takes a substantial amount of money and some time to set up a good porn website and attract paying customers to it. Because there is a lot of competition, including competition from free porn. Your porn needs to be better than what you can get for free on the Internet, which isn't easy or cheap to create.
You probably would have a hard time finding a business partner for yourself to set up such a website. Because the risk would be too great that police authorities in Bulgaria would raid your operation and put a stop to it. You and your partner can lose your investment because of something like this.
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