The erudite starting area just got better with the warrens. But still, not many people there so you might want to move.
The center of P99 EQ is east commonlands, thats where the trading hub is and where you can get buffs the easiest. So leveling close to EC might be easier. Another populated starter area is greater faydark/crushbone.
In any case, have fun and do what you like best
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