At the latest revisions of TC equipment_id no longer exists in creature_template.
U have to set in your creature_equip_template this parameters:
entry: the ID of your creature in creature_template
ID: 1,2,3... It depends if u want your creature to have multiple weapon sets to swap them later. Just leave it like 1 if u want your creature just to have one equipment.
ItemEntry 1: Right hand. These ones are pretty self explanatory, u have to insert here the ID of the weapon, NOT the display ID.
ItemEntry 2: Left hand.
ItemEntry 3: Ranged weapon.