So here it is a Sunday , afternoon , and no one is going to be able to come out , so I roll up my sleeves and keep digging .

And, if I use my profits to roll back in to the business to improve properties, do I pay taxes on those gains, and then put the cash back in, and as long as the house/land is sold within 2020, be able to write off the money I put back in the company?

You'll have a tough time getting a low-down payment conventional loan that will roll in renovation costs.

It can be very rewarding, but it can also test a marriage.

.- Up front mortgage insurance premium (UFMIP), 1.75% of loan amount- Annual mortgage insurance premium, annual .85% added monthly - An additional 1.75% rolled into the loanNow based on my research, I agree on the first two, being the UPMIP and the annual MIP but I have yet to hear anything about the additional 1.75% rolled into the loan.

Very minimal stuff can be done by the homeowner, as long as you get certified by taking an online test.

. , my opinion would be keep the cash especially if buy and hold and roll the renovation into loan. 

You should figure out what you are looking for (training heavy, lead providers, some sort of mentorship etc) and then roll from there. 

If so, the test for corporate (business) limited liability is whether the corporation is separate from the individual, whether the business holds itself out as the owner rather than the individual and whether the business is properly capitalized to avoid foreseeable loss.If you have good insurance, that's basically the same thing as being properly capitalized to avoid foreseeable loss, but you have to realize that any injury over the $1mm mark is probably coming out of your assets. 

Section 8 is not necessarily a bad thing but I'd definitely look at their rent roll and a 12 month operating statement.