Small group help!

Hi ladies, I run a small group for teen girls at different stages in their walk with God. I get stumped as to what to base our discussions around as I want it to be challenging and helpful for them. I also want it to be very simple and Bible based not too complex for girls with not much exposure to Christianity if you know what I mean. I find it hard having both girls with a good foundation and some with none at all. I have covered stuff about having idols in our lives, storing treasures in heaven not earth stuff like that. also need questions/topics that will get them all talking. Thanks ❤️❤️❤️