Test your contractors / handy people out on small jobs first, and ask pointed questions before assigning tasks to determine not only if they are "comfortable" doing the work, but ask: "How many times have you done this specific type of job, and can you show me pics of the end product?"

Locally getting some of the public record data is impossible to get anywhere outside of the MLS.  

We pay close attention to the market and review market data through Zillow and Craigslist regularly, as in at least four times each year we put together spreadsheets on the competition on a square foot basis. 

Direct mail does require you to stick with it for sometimes months at a time or longer, but it can generate some good leads for you (especially if you start trying different templates and companies to test which mailers perform the best).6.

A lot of jobs are remote now after testing it out during covid.

What are the best sources to receive local real estate data I.e( market inventory, average days, median sale price, etc)?

Did you actually do a mold test?

Anyone can wholesale as you know, but what makes a good wholesaler in my opinion is the quality of the numbers and data they supply. 

One last question:Has anyone done the self sustainability test for 3-4 unit property insured by FHA? 

Ensure they are growing their depth with key management for continuity and that they are staying true to their philosophy and model, which should always remain conservative and tested.