We are currently in process of getting our current home set up for a second set of renters. Our first primary has been a rental since 2014.
I agree the hardest thing is finding good tenants. If you have good tenants the rest is a breeze. Our first tenants had low credit, but I listened to their story and wanted to give them a chance... were late with rent the first month. Ended up evicting them maybe 8 months later. Our last tenants were amazing. The day after they moved in the guy stepped through a rotted piece of board on deck... laughed about it really cool. Only called for one other thing. Wish his job didnt move them. They were dream tenants. Just had a new guy move in in May... think I have had 10 service requests... but he pays on time, just calls for very little things. Have been debating managing our properties ourselves. We have management company bc we were not in same state for a few years, but now am back in same state. I think we will keep management team, especially since we want to purchase at least 1 a year. But if u go management team route, interview a few.
Also, I agree... zillow is pretty on target.. also management team will help give you estimate of what things are going for.
Good luck!