They began their company, Magnolia, years ago as a house flipping business and a small gift shop that they still own and sell products out of.

@Valerie Renee BowmanThe easiest way to do this would be to have the seller split the two into two separate contracts. 

We are fortunate to be getting 20% gifted to us.

It's easiest in terms of needing less capital upfront to get the business going, but it's certainly not a simple business.

Newbies need to stay local, IMO.Seller financed notes are the easiest to deal with, one on one and they can be had at a greater discount, I've already explained that.It was either in this thread or the one Dion mentioned above, that I described how to start learning, follow that!

Yes, these platforms need revenue to survive and typically the easiest way is charging a monthly membership or per transaction fee. 

If the former is easiest, what service/app do y'all suggest using?

One of the easiest ways is checking off market Facebook groups in your target market where a lot of deals are posted daily.

Easiest time in history to do a short sale.

To expedite the accumulation of reviews, focus on competitive market pricing, provide exceptional hospitality (aka.. go above and beyond to start... think welcome gift, etc), and encourage guests to leave feedback after their stay.