Conjuror which is the light armor version of the quest is located in Greystone Yard in Qeynos the NPC Gilda right in front of the monk training place gives it. I don't know the freeport one tho.
The quests require you to kill plenty of mobs that are yellow and orange to level 20-22. They get increasingly difficult as you go through them. There are a total of 6 parts with about 30-50 mob types to kill and some have named ones.