Noobish Questions (updated frequently)

[MongoJerry]

2) At what point do you stop soloing? I've found instancing to make a great deal less money than soloing.

The higher your level, the more you instance. Money isn't all that important. What's more important is getting the best items for your character and the best items are typically bind-on-pickup items that drop off boss mobs in instances.

3) Do DoT procs interupt spellcasting? If so, less or more than normal damage? Are different DoTs different in this regard? (phyical, fire, shadow, curse, poison, etc.)?

No, DoT's don't interrupt spellcasting. They also don't stop flag taps in battlegrounds -- a concept that some paladins who continually spam their aoe dot's around flags just don't seem to comprehend.