Or you'll have to do really costly renovations with proper permitting-- i.e take a 3/1 to a 4/3 to a neighborhood that seeks such size. 

The guru your son is learning this technique from is likely not telling your son that the deal will almost certainly encourage your son to get an "off-market" deal from a "wholesaler" who is unlikely to properly disclose the details of the property or encourage an inspection. 

File an eviction with the court and provide the proper notices (e.g., 10-day notice to pay or vacate for nonpayment of rent).

Ensure you collect a proper security deposit (typically one month's rent in Florida) to cover potential damages.Your plan to increase rent next year makes sense given rising costs (taxes, insurance, and maintenance).

Proper research, budgeting, and a well-thought-out strategy are key to minimizing risks and maximizing returns.In the end, BRRRR is an active investment strategy that, when executed correctly, can lead to long-term wealth creation, a steady stream of rental income, and a scalable real estate portfolio.

I had previously posted the property for rent, showed it and screened the tenants.  

I'm happy to send someone, however, if they find everything is working properly, you will be responsible for the cost."

but, my my first question with these posts is why can you not use conventional financing anymore? 

Seller financing is a good way to start if you are looking to sell to your current tenants, other than that, you will need to run into a proper plan why you will need that and how long will it take you?

For the community development dept, you'll need proper plans (architect), site survey, permits, etc. when you're ready.