First of all, welcome on P99, it's a nice a cosy place that I hope you will call home for a while
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Back to your point: if you stick to the main zones (LOIO, OT, DL), you shouldn't have any problem finding a group.
Push comes to shove, you will always find a necro in your level range soloing somewhere. Just propose him your companionship. As a necro, I can tell you that the best duos I've made were with a rogue. That improved the whole gaming experience tremendously: you got someone to speak to, and they improve the speed of killing dramatically. This last point is even more true now with the necessity to outdamage the pet whilst conserving some mana. I rank this duo as one of the best, if not the best for leveling (better than a monk + shaman in my opinion).
Hope you have a good time.
Nagash/Petitpas