Well done for having a go at this activity. I like how you have used group work at its core. You could consider using other students to demonstrate the glossary activity and to provide ongoing support for it. You could encourage them to develop a community of practice (Wenger, 1998) with students who have used the activity before supporting those who have not. As part of this you could also encourage the students to produce their own resources (such as how to videos or whatever they find the most useful and appropriate).