TBH, if you’re just meandering through content you don’t need a single consumable or enchant. World quests will cover repairs and seasonal early AH purchases after like 3 weeks.
If you pvp, world quests/story quests for the first month and some early mat sales will set you up for the whole xpac.
If you are looking to buy medium priced items off AH, but a carry, or snipe something <$1mm off BMAH then this thread has your gameplan laid out again and again (tokens, world quests, maybe some professions and targeted farming).
If you’re here looking for insight to buy something highly desirable (lariat recipe at xpac start, BMAH chase items, gold sink mounts) then you should have already found a niche and started settling in for the long haul.
If you’re pushing content