Is the mentor going to actually walk the deal with you, negotiate contracts with contractors, etc with you?

You can (delicately) begin talking to these tenants now that you're in contract.

I went to Google and searched for "New Jersey purchase agreement" and came up with a lot of options, including the official REALTOR contract.

this is an old old program I had clients of mine doing this in Detroit back in the GFC they would buy a house 1 to 2k sell it on contract for 20 to 30k..

I can legally deny them or other business.

I am working on my RE license for VA and see some gov contracts where JLL "is the Commonwealth’s contracted real estate broker for current real estate services, including with respect to the acquisition or lease of real property and the disposition of surplus real property." 

For a month-to-month lease that isn't under any lease agreement, what could the seller legally do to get the home sold off-market?

No idea because I don't know how much you're under contract for and what the market is in that area.

Understand the basics of private lendingResearch real estate marketsDetermine your investment strategy and criteria for loans, including:- Amounts- Interest rates- Repayment termsCreate legal documents with a lawyerNetwork with real estate professionalsPerform due diligence on potential borrowers and their projectsBegin with smaller loans to gain experienceMonitor your investments closelyConsider joining a private lending group for additional resourcesStay informed about real estate trends, lending practices, and legal regulations

We see fundraising wrapping up within the next 2-3 weeks.We're going to begin to put together pre-sale marketing collateral and contracts towards the end of this week.