Will we be able to pick the name that goes in the URL for our GameListr page:

Yes, when you create your GameListr account, you will be able to pick your username. The username is what will be used for the URL.

Can we keep our free account?

Thee free account is absolutly free, forever. And you can customise it just like the Premium plan people do. However, you will be limited to selecting a single system and 10 games from that system. We call the group, "The 10 Games I Currently Play" This great for people, especially game streamers, to display a list of games they currently play.