I just hit lvl 10 on my CNJ character, still feeling every bit as lost as ever... I'm starting to figure out how to read the map, but I still struggle to find my way around.

Not sure when I can get to some content other than these early errand quests-- how do I play with other people?!?!
I've done a few fates and had people join in those, but are there such things as "dungeon instances" or anything like that?

So, how do I start getting to the fun stuff???