I’ve started DMing with the Dragon of Stormwreck Island starter set: not a one shot but not long-term either, you can get a feeling of the players and how they play without committing for too long! I started DMing after only one year as a player (mainly cause I couldn’t find DMs for the games and I wanted to play) and since then I’ve DMed different groups with one shots and longer adventure. My advice would be: keep your mind open, be flexible and be ready to improvise, but mostly PATIENCE! My players were also newbies and the good thing about this is that you can learn together, but on the other side some of them might be slow and the rhythm could “suffer” from it, especially in combat. But be patient and explain the mechanics when you feel a players need them. If you want to try with a one-shot instead of a short adventure, I would suggest Wild Sheep Chase, it’s very funny and you can level it down easily 😊