Sorry buddy, unless you have some gold to spend, there is no way to make "fast" gold. Takes money to make money. You are going to have to do it the ol' fashioned way like the rest of us. I recommend farming cata and mop raids.
Probably the fastest way to farm gold atm is the Firelands trash farm on bdk with enchanting skill to dis all greens to make bags later from cheap cata cloth bought on auction. But it depends on your realm, sometimes just sell greens is better. It is around net 3-5k profit per hour when you finally sell bags you made. And for sure i believe you should do that on May 13 account without bot help of any kind next few weeks cause our accounts can be flagged and autofarming instance can fire the alarm.
farm wod mats and sell the greens while mailing the wod mats to a bank toon. i'm making 10k every 2 days just from greens
Just take your pimped out main, do all the garrison missions and then all the LK and Cata raids. And you're at 30k gold