I misremembered where the Throne of the Tides instance was. I thought I read it was in Uldum, but oh well. WowWiki for the win.
To get to Vashyr, go to the stormwind docs, pick up the quest, and have some reading material while waiting for the docks.
I also fail at breathing underwater in Vashyr. Elixirs of water breathing might sell well, especially if you take them to the zone and offer them in /say (would probably sell for 50g+ each - at least while the chaos is on at the start of cata). Once toons have got their permanent breathing they will not be interested.
WoLK flasks seem to be selling OK. I suspect that health pots will too.
Remember to post your gathered materials on the AH before you log out for the night. Mail everything to a bank alt and post it. If in doubt, post it too high. Take advantage of the players with gold that just want to level professions now. Unless you are going for realm first, wait a few days to level your own crafting professions.
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