Testing an app

[iostream00]

I'm not sure if this is the right place to ask this question but I used to upload my apps on the google developer console and then you had the roll-out option to send them for review. Now I've been told that I have to test them before, either with an internal or a closed testing. But once I send an app to a number of people, how does it work to have it reviewed? I don't see the roll-out option, should I wait a few days? How does it work?