I did my first mythic dungeon in Battle for Azeroth tonight. My friend Yotor and I formed a group (he’s a tank and I’m a healer) so we were able to simply request DPS join us.
If you haven’t played WoW and done mythics, the way the LFG tool works for mythic dungeons is that you list your group and people can apply to join. You get to set an ilvl requirement and a few notes. When people apply you can see their name, class, spec, and ilvl. In a way, people are applying and you can accept or decline.
We listed ourselves and asked for 3 DPS, and within 10 seconds we had a list of 30+ people wanting to join us.