How to start a procurement function

I am a CFO at a non-profit real estate developer/owner company and I think we are at a size and spend level where adding a person dedicated to procurement will provide tangible benefits to the organization. We don't have any in-house expertise in this function though. Any advice on how to get this started, including thinking of developing a reasonable scope of work for the position? Does anyone have recommendations on consultants that can help with starting this function, defining the scope, perhaps even acting as an outsourced procurement manager for some time? Thank you in advance.