Hey Fidelity.
As Senna mentioned id recommend you join either a guild or community that are dedicated to running m+.
I’m part of the calm keystones community. Its a community set up to run any and all m+ without the worry of raging team mates or people leaving keys and i’ve found it be a great place to learn m+. We predominantly use discord as a way of communicating in dungeons.
The link to the community forum post is below if you want to check it out and maybe join or message me in the evenings.