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

Depending on local regulations, you can mix up STR/MTR/LTR. 2) Get systems in place in those exact cities; 2 PMs preferably via NARPM, 2 high quality inspectors, and rotating book of handyman, 1 lawyer, and a credit union contact for leverage along with investor friendly nationwide lenders.

Credit Union, Brokers, Banks (all have different advantage & disadvantages). 

Have about 50k I would invest (access to more), with excellent credit and good income too, from my full time job.

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

Knowing cap-x projected out years is not an "extra credit" kind of information, it's fundamental necessity. 

Leveraging a HELOC (home equity line of credit) could allow you to invest in multifamily without completely draining your savings.

Cards and board games for older kids but they will all have tablets or phones unfortunately. 

The only example I can think of is that I asked an applicant questions about their credit report.

We consider background checks and credit checks only good for 60 days.