Like should I have a folder on my laptop for the tenant and keep a copy of each payment I receive from them?

I'd say three months on the short end to six months on the long end.Oh!

Third party servicing company for $35/mo handle taxes, insurance, escrow, tax forms, statements etc.

Go with someone with solid google reviews and over 5 years in business and move on if needed.

There was even one exceptionally kind Bigger Pockets member that seemed to know a lot about health and physical activity that we even chatted on the phone afterwards and he gave me some good pointers.  

This post violates 3rd party agreements and confidentiality terms of service.

There are plenty of great folks on here to help you on your way.

I have them on several units and no issues.

Quote from @Jeffrey Hill: There are a couple of challenges with financing the difference. 1) The current servicer has to approve it. 2) Finding a lender to do a 2nd mortgage at 100% CLTV is almost impossible.

Good wholesalers will price deals well, meat on the bone for you.