Looking for financing advice for refi on paid for rentals

[Aaron Starr]

hi guys, im looking for advice on what to do. Im 31 and own a 17 unit mobile home park and 2 rental houses

i have never used banks before my credit is not the greatest maybe around 630-680 score but all my properties are paid for 

i need advice on where my net or gross income needs to be for the bank to approve cash out refi or a line of credit.

where do i go from here i want to expand and buy more rentals.