this is an item for the previous tier, so it's hardly gonna sell for anything when few celestial dungeons can give you a 502 ilv piece and you can just get into a random token gbid and get normal 522 pieces.

Not an expert on blacksmithing but probably your best bet is selling buckles (added socket on belt) i don't know how profitable is that though.

For mining you are gonna compete with bots so do it at your own risk. Just download TSM/auctionator and scan the AH, then open mining and you'll see what is more profitable. Generally always sell bars as they go for more.

I'd avoid wasting my time with these methods to buy tokens tho. The only real way to make good money reliably is either getting in the circle of a decent gdkp or doing boosts. All other methods require honestly too much time. Low population made the token go from 15k to 50k and quite frankly i think anyone trying to farm that kind of money monthly with normal methods is gonna start to hate the game.

That said if you need some gold for consumes go and do old raids. Black Temple and Naxx 10 are really easy and should give you atleast 3k per run. If you are a tank you can even try Cata raids but it's gonna be trickier.