As others have noted most counties have online tax estimator tools you can use. 

You can look up his case online.  

Just because you found some listings online doesn't mean they are operating legally.Free AirDNA is a great starting point, but it can't give you all the answers. 

You can find them online.

I've seen two different people use RTA Cabinet store online.  

I kept plugging away,  looking online at properties, using the rental calculator, going to see the properties either virtually or in person and then if feasible making an offer for 60 days or so.   

Just in the process of listing our first rental online for the first time.

I have isolated all the water lines for my units but haven't figured out if I should call the water company and have them sell me water meters or if there is a water meter I can buy online that possibly hooks up to wifi to report usage.

Is there in-person training and online training available?

Check those as well as online job sites, and check around the various realties in your area to see if any agents are looking for administrative help.