Shared World + Adventurers' Guild: a way to solve this problem
In a shared world, all who DM agree on how the world works; you then each take a sector of the world and run your campaign in it, now and again meeting as DM's to see if something that the party did changed the world substantially.
Each PC is a member of an Adventurers' Guild, which provides a hub for starting points in each given area. Use whatever version of "a permanent teleportation circle" feature the edition has to make the movement from area to area logical in-world. The party arrives at a Guild location in the DM's area before the sessions that DM is going to run begin.
My current group uses a shared world, three DMs. Whoever is DMing has a player who is either "ghosting along" in the background, or has downtime duties/activities while he/she DMs and the others are taking on the adventure they are running. You can either keep their XP about on par with the groups who is engaged, or let there be slight differences; discuss that with your whole group before you start doing this.
We have done stuff like this in three editions of the game: the original, AD&D 1e, and D&D 5e. Three of our players don't want to DM, and that's fine! Those who do have a reliable cast of characters who move from area to area.
You lead by example: DM the first few sessions
Part of what you are doing is introducing new players to the game. To pick the DM for the next few sessions after that, draw straws or roll dice to see who does the next few sessions, trying their hand as DM. Then rotate again.
Since most are new, have "after the session" wrap ups to discuss "we liked this, we didn't like that, we are confused about this" kinds of discussions. Learn together. It's fun.
While I suspect that a Westmarches style campaign could be done this way in the current edition, I have not done that first hand in 5e (though we are a bit sand boxy in our shared world) so I won't do more than suggest that you explore that option as well for a shared world.
Matt Colville suggests that using two other RPGs - Microscope and Kingdom - to build the world together is a way to get the players to all invest in the world.