What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

You would only have to recapture depreciation.If you have more than $250K of gain ($500K if married) then you could do the same thing and take the $250K tax free. 

Aaron - I invest in the Philadelphia suburbs and it would be great to connect.

Your question is a little confusing; what do you mean how do you do STR with a mortgage?

Its a single family house in dallas.

- Do I need to have a business set up?

Ive recently come into a large amount of $ due to an injury settlement and im looking to do all great things thru real estate with it.

Got a lot of experience abroad but none in the US.I got contacted by an agent at New Western, but1.

No, you said how does one find a "deal" without a wholesaler, it's very simple, you simply put in the work to either (A) be found by these sellers who are "deals"     -OR- (B) you approach them yourself. 

You can always ask for those items at any time, but it doesn't mean that you'll get them.