Rental property requirements before renting out

[Teodoro Vecchio]

Hello All! 

I, alongside my brother, have just recently purchased a duplex in Grand Rapids, MI. We are touching up one of the units currently and before we rent it out I was wondering what type of safety requirements do we need to follow to follow all local and national laws when it comes to landlording. Some obvious ones that stick out to me are smoke detectors and carbon monoxide detectors but how many and where and what else is required before legally renting out a unit. Thanks for the help!