| Servers: AB is the most populated, so that's where the vast majority of us rolled.
Leveling/Grouping: EQ2 has 4 classes. Fighter, Priest, Mage, Scout. Past that comes the flavor, and what makes each class fun to play. but if you need one of those basic roles, you can take pretty much anybody from that class and get by.
Raiding: SKs suck. Bruisers and monks aren't great right now. Paladins seem pretty mediocre. As for IN demand, that's kind of a weird question. In EQ2, you only want a few of each class. so not every guild will have the same needs. Generally, though, most guilds need more of the classes that aren't any fun to level. Templar, inquis, troub, shaman.
Adventure Packs: Fallen Dynasty is quite good.
Station Pass: don't use it, can't give an opinion.
Races: Race really doesn't matter much, if at all.
Classes: There's an eq2flames link in the other thread on the front page that goes through this pretty well.
Instancing: Mixed. Some dungeons are instanced, some are not. Most dungeons have an instanced portion. Most raids are instanced, though there are a healthy amount of contested mobs to kill. On AB, though, we're not going to see a contested raid mob for a LONG time, due to the high raid guild population =/ | 