Hey there,
I can answer the second question- No, you no longer need a cdq to get to level 21. You would need one if you wanted to become a WL, which is a different process. If you want a cdq though, you're more than welcome to ask for one!
At that time there were known communities of Ghostwise on Vanavar (near the grey elves), Corsain (the Blackwood), and somewhere in the Dragon Isles (atm there is a specific group called the Quickvine on Girrac, but there are a lot of primal foresty places there). I suggest not the Dragon/Serpent isles really, because of it would be difficult to get a lightfoot out of them with such little opportunity for contact with other races. There are several other forests that are pretty good candidates for at least a small group of Ghostwise, but for a farm below and goblin raids... *wobbles hand* You could always just pick one and make it a small community so it's unobtrusive - it was a very long time ago that Quenton left the trees, so no one will notice that they'd never heard of a goblin raid in the Forest of Voices, for example.
You could also shoot for a really big one like the Wolfswood, instead, so that a small group would go unnoticed by all but the rangers. Plus, they stay so isolated it's probably IC for someone to say, "I didn't even know they were living there" no matter where you picked. Just some thoughts!