Great activity. An idea I had when looking at it was that they could also practice WH-questions What's your name/Where are you from/How old are you? etc...
As regards the wh-quest, Joao is going to think about a follow up activity. Perhaps sth to do as homework. Perhaps preparing some questions would be great for them to think at home what they know and what they would like to know about their new classmates.
So, do you think the instructions are clear?