There are many I'm a part of like "STR Homes for Sale" and "Florida Off Market Real Estate" (I'm sure they have groups for different states) that offer a great array of off market and listed deals.

Thank you76542 is going to be the best zip code to be in. 76543 you are going to want to tread carefully and be sure to check the specific neighborhood and street you are looking at. 76549 has 2 divisions that are very different.

Different lenders have different guidelines.More on how DSCR loans work:DSCR loans won't use your income to underwrite the loan. 

You'd need to come up with the seller's equity (the difference between the loan balance and the sales price). 

State's differ quite a bit not just with their laws but with how certain aspects of a sale are customarily handled.

I do partnerships many different ways, some I split the equity on the sale; I'll bring the deal, and partner with the person investing because I brought the deal to them. 20/80, 10/90, 40/50, etc..

I've never heard the 25% thing before, but any difference between FMV and sales price would technically be considered a "gift" with potential tax implications for your parents.You can avoid most seller costs as there's no reason to use agents in this case.As an FYI: I always recommend avoiding a FHA loan, if you qualify for a low-down payment conventional loan.

This is very different than other markets where the majority of homes were built after 1960.So, I suggest first learning your market.

A Hotel is totally different, as is a RV park or camp resort.

What will you do differently to achieve that goal?