First off you will need this program. http://www.mmowned.com/forums/bots-p...-released.html
After that you will need to go to the barrens and head to Wailing Caverns. Then head inside.
Find a nice fishing spot and turn the bot on.
I set mine for like a hour or so when I'm home and awake and just watch TV and at night time I let it run all night.
Once you are done just hit ext and open your bags. There should be stacks of deviate fish and other type if fish that you can use to level your cooking if it's low.
You can sell these on the AH for about 15-30g a stack depending on your server. Or if your a cooker you can make then into Savory Deviate Delight and again depending on your server make 30-60g a stack.
All the credit for the bot goes to Ziao. This is just one of the ways to use this bot to make lots of gold.
Good luck and happy fishing