Question about content sharing

I think I understand the subcriptions for dnd beyound, but I just want to make sure. I run a D&D club at my school. We have enough players to regularly have 3 campaigns going on. We don't currently use dndbeyond, but I'm probably going to start using it when school starts next year.

I'm curious if each DM(myself and the two students) would all need subscription accounts or if I could get one Master account for the school and content share with them so that we can each run our own separate campaigns. I know it says you can content share with friends, but I wanted to make sure you could content share any DM-specific or campaign creation content with other accounts or if it was content sharing things to create characters and campaign-joining stuff.