How do I find a mentor that has lots of experience doing this stuff?
Online and also in person.

Somebody who knows what they are doing for a long time now.
then you should put here in which country you from so someone from that same country will offer you services,but be careful as most of people that will contact you for sure is scammers so keep that in mind
But if i were you,i will just continue reading here and watch videos from internet to find some good points on how to manage profiteering here