Is using it enough to trust the numbers to make a deal?   

For monthly rent payment, do you usually have it due by the first day of each month or pay in advance like one week ahead of time?

what is the mortgage balance, is it current, how many payments back, what are properties selling for in the area (is his price above or below others), *how much seller financing can the seller take,* how much cash above the mortgage would seller accept, how fast does the seller want to get to the settlement table, what repairs or up-dates does the building need - you could ask if you had $10,000 to spendon improvements - what would you spend it on?

Thinking the foreclosure process is similar to repossessing a car and if a payment is missed they can “just take over” the property3.

I have a home I bought in AL that's on section 8 right now at a purchase price of 72k (loan 57k) after down payment. local banks it's easier for them to finance it.

Even with 20% down, monthly payment is $2,200.

your payment would 4300/7550 =57%.  

Are checks/receipts/proof of payments needed or would transfers be ok?

Have 100k sitting and a few real estate investors in my network who have inquired as to whether I’d be interested in helping to fund their down payments for fix & flips. 

The borrower is not personally liable for the loan, and the lender cannot seek additional repayment beyond the collateral.Since the borrower is not personally liable, they can choose to make larger or additional payments to pay down the loan faster if they wish.