Typically people just shout for a group. You're better off in a group as everyone's contribution gets lumped together and you'll get gold more often than not. Of course if you plan on queuing for dungeons while doing FATEs you'll have to go it alone. (this is what I typically do)

Also, strategy for CNJ is you probably want to toss around Aeros on stuff and heal where needed.

You can probably go from 15-34 over a few nights of playing, around 4 hours per night.