I have had several inquires about the property as a rental and the majority of them have been people on disability benefits. 

You have to bake the management fee into your deals to make sure they still pencil out (which you should likely do anyway), and you let them handle a majority of the work.

I’m an 18 year old real estate agent also in college as a business major.

Posting on random/obscure booking sites will probably only account for 1% of overall bookings. and the vast majority will come from the big players (Airbnb, VRBO, etc). 

If you're still worried go with the accountant in the state you are most worried about and plan to own the majority of your properties in.

You arrange the LLC deal so that in the waterfall, you and Sis get the majority of profits over this baseline threshhold. 

Map courtesy of https://www.submarinecablemap.com/landing-point/hillsboro-or...According to the Hillsboro Herald:Hillsboro’s Data Center Market Booms in 2023Hillsboro’s data center market experienced explosive growth in 2023, solidifying its position as a major player in the U.S.

The majority of that time I was using it for personal gain, buying properties essentially for myself. 

It's a major project, and finally nearing the finish line!

No - "DSCR Loans" are for residential investment properties only (with only a very minor exception for small mixed use properties that are majority residential in nature in every way)