yea, i've soloed to 46 with the exception of grouping once with my guildies in unrest (was maybe 20-30minutes). It's not that I don't like grouping, it's just that my classes on live were all grouped to 60s, so i wanted to solo a necro to 50. it's actually quite fun and very efficient.
uhm... well, we don't like to give away our secrets, especially since it's only classic and the spots are somewhat limited. but i'd get to qeynos and do blackburrow until 12 and then WK bandits. by then, regardless if whether you're human/DE/gnome or erudite, you should be at least apprehensive to all of qeynos. hand in gnoll teeth and bandit sashes for exp/faction/$$. at 16 i did unrest until 20, though you can pretty much solo unrest until low 30s if you really wanted to, that's how efficient you are at killing undead.
EK at 16-20, SK at 20-25 or higher if you dont mind the zone, i quite frankly hated it with the exception of splitpaw entrance. they drop some good loot and go down fast when feared.
after that you'll have to make buddy with me if you want some tips
[You must be logged in to view images. Log in or Register.] For the most part the solo spots are the same as the grouping spots on this server. Ive found i've made quite a bit of cash soloing as opposed to grouping. It can get a little tricky when your usual camps are taken, so might be a good idea to have an alt as well. good luck