If it's currently an STR they should be able to provide you with the p/l statement from prior years so you can see gross rents, operating expenses, average daily rates and occupancy levels.

The value of the info he provided cannot be understated.Residential RE is more challenging then a few years ago, but there are a lot of ways to make money in RE.  

You do not need to provide tax returns, W2s, paystubs, etc.

but they don't provide current rent, value, what they have capital wise, etc. 

The place I used provide cost quote and estimated savings at no cost. 

Their pro formas felt optimistic with providing 6% annual appreciation and property management that is only about 6% of rent so I take it with a grain of salt (they offer their own property management services but it has terrible reviews on Yelp so I would probably go with someone else). 

That makes your bookkeeping easier, and it can also provide liability protection if you hold title in an LLC.

Denton County offers opportunities in suburban and college town markets, while Grayson County provides affordable entry points with cash-flow potential.

The one aspect I'd say where planning can really provide benefit however is with tax planning.  

I am sure you want the financial freedom and flexibility real estate provides.