I founded a platform that helps investors find and compare hard money lenders.

Pretty new to the platform.

I advise newer and existing agents to hire a sales coach or mentor before spending money on leads, whether it's through Zillow, BP, or some other real estate-related platform. 

Yes, there are a few platforms that do that for you.

My current platform charges $55.

If you are getting an email or text about a wholesale deal, I guarantee all of the legit buyers have already passed on it because it's not a great deal. 

It sounds like you bring a ton of value to the platform given your past experience.As far as where to start, that is difficult to answer without knowing more about what you're looking to accomplish and how hands on/off you intend on being with your investments.Turn-key companies have tremendous appeal given the fact that they target below-market value properties, handle property management and project management.

Quote from @David Kulbacki: I have never heard of any platform restricting a guest from signing an agreement.

We've always done all the work ourselves, which may not have been the smartest angle for a couple of legit reasons. 

I would gladly pay a legit mentor to help me fast track the process of finding properties to do this with.