Hey there Heraveth.

If you are a European player, the Ragnarok server is a pretty good server. It's pretty active, and there are always people online.

To answer your questions:

DPS classes have the hardesy time finding a group for end game content on the Duty Finder because DPS is the most common type of class. There are only three Healer classes (White Mage, Conjurer and Scholar), and I believe the same with Tank (Marauder, Paladin, Warrior). That being said, if you queue up with someone that is playing either a Tank or a Healer class, the queues go much quicker. It also depends on whether you're talking a Light Party Duty (4 players), Heavy Party Duty (8 Players), or a Raid/Alliance (32 Players).

I am a party of a small friendly Free Company called "Ren Geki" on Ragnarok, and we'd be happy to accept new members, even new players.

If you have any other questions, let me know.