Alternatively you can always do a /who all 15 20 (or plus or minus 5 levels of yourself) and see where the bulk of people your level are at then send one of them a tell to see if you can join them.
Dont forget upper guk (i mean mielech-a) and even better bang out some of the main quest, you can get a few levels doing some parts of the main quest! Look at those notes from your dream... they unlock the clues.
Im a lvl 18 mage. I was doing fine until i left fighting in BB. Now I cant find anywhere to get exp. I never seem to be able to find a warpstone group. So any suggestions on where to hunt?
I believe that the books (not the questions) are also on the wiki.