-What character should I make for best aoe?
hunter make the highest damage.
incar has the most aoe skills.
bagi are a good allround.
-What items should i use on that character?
Depending on the level. i would start to try upgrading to +1-2 with level range 70-90. upgrading +3-5 with level range 90-110 and when u can where the last extension set try +7 to own 
-Whats the highest quality items. What gems should I use. is there a way to upgrade the level of the item or should I wait to make decent items at high levels?
highest items are at moment extension set (helm, armor, pants) arround level ~110. then use t3 gloves and boots. the highest weapons at moment are level 115. they will add level 130 weapons with the new patch.
-Any other info i should know?
Play the game, read some topics here in the board and u will learn alot.
