Hi Carlo,
In each of my locations (FL, IN & CO), it was slightly different...in Indiana, where I'm originally from, I asked friends and family for their suggestions on plumbers, painters, handyman, etc. In Florida, I have an amazing neighborhood with wonderful neighbors. I met the neighbors by door knocking and introducing myself when I was in town. I built good friendships and they are a resource for who to call for each activity. For Colorado, where I live and work as an RE agent, I joined the local chamber and started a networking group. Through those channels, I connected with each industry for my rentals in the area.
I usually look at Google reviews before calling. If they are positive, I'll call and if they don't answer, my vetting is strongly based on time to call me back. I usually will say who referred me to them and say that they are a friend, neighbor, family, etc and will then ask what their lead times usually are for work to be completed, how they communicate, are they comfortable working with me being out of state, how do they collect payment (terms and preferred method) and do they offer a business rate?
Happy networking and best of luck!
~ Lindsey