Now that you have your SQL Server Availability Groups up and running, how do you know if there is a problem? You can always look at the AG Dashboard, or even better you can set up database alerts to send you an email or page you in case of certain problems.
Tag: availability group
Add a Database to an Availability Group
You have additional databases that you want to add to your already created Availability Group, what do you do? Follow these directions, and you will have them added in no time.
Jim Salasek's SQL Server Blog 