i started soloing in Kaesora on my red server paladin at level 42. probably could have started it earlier though. just make sure to study the map a lot.... getting back to the exit can be confusing after the initial drop in.
here's a good old guide about kaesora, written by a paladin:
http://www.angelfire.com/rpg/whitewi...es/kaesora.htm
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the best spot for you to solo at is at #3 on this^ map, and the tunnels to the north of #3. if you get a group together you can head towards the library or the church where the boss of Kaesora, Xalgoz, spawns.
added bonus about Kaesora: melees can bind right outside! the ruins around Kaesora in Field of Bone are one of the few non-city locations that melees can bind at.