Welcome to the server, and to EQ.
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Support classes eh, well Cleric, Shaman, Enchanter, and Bard are all support style classes.
Cleric is all about the healing, can also give some buffs.
Shaman is all about the buffs (and debuffs on mobs), can also do some healing.
Enchanter is all about many things, buffing (awesome things like mana regen and haste), debuffing, CCing, charming, illusions. They are also a tough class to master.
Bard is about a little bit of everything, they can give a plethora of benefits to groups via their songs, they also have the most active playstyle of any class in EQ, somewhat similar to the mechanics of modern MMOs.
All 4 classes can solo well (clerics less so, though they can solo undead well).