Creating a platform to sell Proxy or VPN?

Question

VPN

Hello!
Tell me who is in the subject or who had the experience of creating a site selling a proxy or VPN
. How difficult is it to create everything and configure it?
What are the pitfalls?
What specialists are needed to create and configure ?
Perhaps someone would like to jointly create such a platform or someone can do everything for $?
Guys I know make a lot of money selling proxies