1. Come on... I'm from EU but didn't have a minute of lone playing at Besaid..
Cornelia suuuux :3 Imo US players are more frendlier than EU
2. Yeah, people often party at lvls 10-15++ to do leve quests at camps. Also every (or almost every) camp has an event called "Behest" . You need to talk to NPC that appears every hour to register for event. After u register, u'll find a scroll/paper icon near your name. After that u can start gathering other people with such icon into a party or just ask to be invited. Then there's a mission to kill mobs (the more people in party, the more mobs to be killed). It's pretty awesome EXP boost, would be stupid to not participate in Behests.
3. Yeah, Lvl Thaumaturge+Conjurer. The only mage classes yet. They both have heals, buffs and attacking spells. Conjurer is known to be more DD, when Thaumaturge has more support buffs. But still, there's no actual pure support class in the game. Hopefully they will add class upgrades so there'll be more difference between classes.

