Renting a Single Family with Detached Garage Apartment

[Jobin V.]

Question for y'all- about to pick up a cool property near the Heights that's a single family home (1600 sq ft) that has a detached garage apartment (1100 sq ft). How do I go about renting each out to separate tenants? There is only one address so how do you handle mail for example?

Anyone have experience renting these out?