You'd be better off choosing two gathering professions , eg herbalism and mining or skinning. Once you have enough gold you can then swap professions if you like.
I wouldn't recommend Engineering as a profitable skill but it is a fun profession.
Check out this site for general advice on professions
for a more in depth guide. The latter has advice on using add-ons to enhance your Auction House experience if you get the gold goblin bug.
But if you decide to stick to two gathering professions then the plain vanilla auction house is fine.
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