Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

Submit it!

I have a cousin who funds RE deals and he has a whole network of money people, so I am putting together a business plan to submit along with my financials and an investment proposal.I am coming from single family residential, and have only ever worked with hard money for short-term loans, and also some smaller amounts of private money.

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

I understand there is also property management software that combines ACH payment capabilities with feature with basic book keeping features, perhaps work orders/repair requests, document(lease) archives, leasing/listing features? 

Document List (state.ny.us)

I get this but the provision also requires the LLC that holds the property to submit to the local jurisdiction wherever the Qi files.

https://www.biggerpockets.com/...12 Frequently Asked Questions (And Answers) About DSCR Loanshttps://www.biggerpockets.com/...8 More Commonly Asked Questions and Answers to DSCR Loanshttps://www.biggerpockets.com/blog/eight-questions-and-answe...What Documents Do You Need for a DSCR Loan?

After i posted, i did check with the lender (it's actually a box that's also checked on the closing documents that i didn't realize) but my loan is not assumable if i sell the property.

There are short term construction lenders FULL DOCUMENTATION, the whole novel of borrower past 30 months.