Creating a fully automatic proxy website setup "Need Guidance"

You need to make the api flow, which is easy I think but the algorithm of managing it will be difficult. I have also tried to build mobile proxy farm but In my country it is not legal or may face any issue so reselling will be the best bet.

I think In $5000-$10000 is required to start this type of website and also some money money for marketing as it is a very competitive niche. Already many people are doing the same thing. You rather try scrapeapi alternatives maybe it is also a good idea.