You've left out some important information such as purchase price and occupancy level. If the occupancy is low, and by low, I mean lower than 85-90% you will have trouble finding any conventional financing.
That said, you've already gotten a realistic range of how much you can expect to put down.
More than that, considering this is likely to be a smaller loan amount it will almost certainly translate into a full-recourse loan. As such, your credit, income, and assets will factor into the underwriting process. The fact you have no landlord experience will likely not go over well with lenders given the number of units. Hopefully, your father's experience can make up for that. Does he have multifamily experience or is it relegated to residential property? Is there existing management in place?
I can't tell you what terms you can expect based on the lack of info, but with regards to the actual term of the loan you could feasibly expect a 5-year fixed loan with a 20 - 25-year amortization.