Everywhere from level appropriate mobs. Like the 59-70 armor doesn't start dropping til 65+ mobs normally, and rarely off of 60-64 mobs, maybe slightly lower.
I second defiant, 'cept for weapons for melee / hybrid. You can usually find twink stuff in the bazaar that is better ratio (damage divided by delay, or for Rog, backstab damage in primary piercer) for cheap.
That being said, the post at
https://everquest.allakhazam.com/forum.html?forum=1&mid=1257098999157712273&page=1&howmany=50#msg1257117320232309003 may help some. There are also some good (better ratio than defiant) weapon quests in Blightfire Moors. See
https://everquest.allakhazam.com/db/qsearch.html?zone=432 Defiant is so good, that a full set of the Tutorial gear is more than good enough until the 50s, along with whatever defiant drops you get while leveling. Another source for defiant,m besides drop and Franklin Teek's hotzone quests, and the defiant jewelry merchants in PoK in front of the Crescent Reach stone, is following the Hero's Journey achievements (/ach in-game command). See
https://everquest.allakhazam.com/db/quest.html?quest=5553 Alternative for wrists and jewelry, is to go with various Trio setting jewelry and augs. You could go with Platinum Trio stuff by your level, along with various cut Underfoot Diamonds or Taaffeites which will be the most expensive part, along with Round Cut Opal (HPs) along with Peridot (AC) or Emerald (Mana/Endurance). This will easily max out your stats (why you use different cuts of Underfoot Diamonds and/or Taaffeites), and 10 or 14 with Peridot AC, 10 to several stats and resists, and 160 HPs, and 100/160 Endurance depending on Peridot or Emerald.
Yther Ore.