Credit score requirements and lease resource

[Daniel Sager]

I purchased a 4plex a few months ago for house hacking and inherited 3 tenants. I have since gotten rid of one of the tenants and have rehabbed the unit. This is either a B or C property depending on who you ask (decent area but no garage etc).

My questions are what most of you folks require for credit score minimum and what is best resource for a solid lease? Existing lease previous owner used left some to be desired.

Thanks!