Multi-Family with Back Yard

[Malik Edwards]

Hello All, 

I recently purchased a large 2 family home. This is my first multi-family unit. I've never had to worry about two families occupying the same space. Can anyone give me advice on:

How do I decide who can use the back yard when both have access? 

How to handle noise complaints and what stipulations should I put in the lease?

Snow clean up? 

Anything else I'm ignorant to.

Any help would be appreciated.