I get paid within a day of arrival (I now set up direct pay so I will handle my own payments going forward).  

They send payment via "Cashapp".

You only need a place to track tenant information, payment history, maintenance, etc.

Some companies still connect us with their employees and have them work with us directly on the lease signing, rent payment, etc. but we have also had a couple companies sign the lease with us directly.

Most lenders are going to want to see a few big things from the ownership group. 1) The borrower will be the enitity (LLC, S-Corp, etc) and any owner with usually 20% or more of ownership in the entity will be expected to guaranty the loan, 2) We'll want to see some experience doing similar projects from at least one of the main owners, 3) We'll want to see bank statements showing liquidity enough to cover the intial cash injection (down payment), the closing cost, and some cash in reserve.

Maintain a credit score of 620 or higher, save for a down payment, and research markets carefully.

Late rent payments, etc. 

You share the lease, you share his payment history, and you give a total of what is owed.

No, just inform them you are the new owner (they may want proof) and provide them with the address to send payments. 

You inflated the price $70k but they are only making $50k in payments.