Roles and responsibility- Property Management Biz

Hello Team!

I am maturing my property management approach, and will be partnering with my former college roommate, who has been helping me with recent renovations. I'm wondering if anyone out there has information on how to properly set up a dual-member LLC, as far as roles/responsibilities are concerned? I have 3 duplexes and 1 Quad in Minneapolis; it's time to formalize a bit and streamline processes.

My Background-- sales and business mgmt. So, probably AP and Leasing.

My Friends' background- construction. So, I'm thinking incident management and physical facilities management.

There are many more aspects included in REI, which I'm not accounting for right now. Any ideas you can provide would help our operating agreement. It would be great to do the legal work upfront-- making for a better working relationship from day one.