How can i earn from Rental properties?

[Jasraj Singh]

So i was thinking of buying a residential rental property with 4 units near where i live and the seller is asking for $ 4,88,590 and the rent that i assume i’ll be receiving would be $ 876 a month from 4 tenants. 
So how can i earn from a rental property? How would i cover the amount of money that I’ll invest? Cause i am investing a lot and I’ll receive very less every month?