If you cannot advise me on what to do to make gold, I believe my time will be better spend leveling up an alt. By picking up the loot and completing a handful of quest I should be able to acquire just enough gold to sustain my first days in Cataclysm.
You didn't explain why you don't buy cataclysm right now and make gold by questing + leveling and selling Cata dez mat and so on...
Without cata you can't fly in Azeroth, so best zone for farming are bc and lk.
Otherwise level a DK + Herb/Mining, use herbs for your glyphs or sell raw herbs.
Sell the ores to auction house.
Otherwise, chain kill mobs at bc donjons, it gives around 100 gold per run, 600 gold per hour + make bags that sell for 10-20 gold/u.
You can also do Argent tournament dailies and every 3-4 days sell a pet for 2-4k.