when you are of level to start the class quest (9, i believe), the quest should appear in your journal as a hallmark quest, which will be one of
these. the quest text will direct you to the npc you need to speak with to begin it. you can access your quest journal by hitting "j".
you wont be able to ding 10 until you complete yours and choose a class.
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EQ: Runyaessz, 5 Monk, Phinigel
EVE: Runym/Runyn/Runyl, 43M SP each
SWTOR: Pardoric, 22 Merc, on vaca
EQ: Runyariel Varyuvantel, 65 Enchanter, Tarew Marr, on vaca
LoTRO: Runyarian, 38 hunter, Vilya, on vaca
WoW: Runyarian, 70 hunter, Muradin, on sabbatical
EQ2: Runylala, 25 Troll Bard, Qey, Blackburrow, retired
WAR: Runyael, 30 DiscO Khaine, Ironfist,retired.
CoH: Hissing Chicken, 16 Scrapper, Pinnacle, retired