If there's a small light on the USB drive, it usually is to show you when it's operative. Assuming it's not faulty because of a loose wire or component, a light blinking very fast indicates that it's processing a lot of data (probably many small files).
Azeroth.
For World of Warcraft this is certainly possible, since it doesn't need to be in a fixed location to run. Even on a flash drive, ssd or smart/thumb drive, as long as it's connected to a PC it can run. If the drive itself isn't fast enough to properly run the game you may need to copy it to a PC, but otherwise its location doesn't matter.
world of warcraft.com
There is no "Fast" way to do it. You simply just allow the installation discs to run their course of getting all of the files on your computer. Alternatively, you can download the games from the World of Warcraft website.
Through the Mining and Skinning professions.
You must do a lot of quests and go to Raids and Dungeons!
This is an indication you have a bulb burnt out on the side the blinker is blinking real fast.
The LED light is blinking fast because it is receiving a rapid electrical signal, causing it to flash quickly.
I'd recommend Zul'Drak or maybe Grizzly Hills.
World of Warcraft gold can be purchased from Fast Gold, Fast WOW Gold, My Games Bank and Warcraft Gold Store. Some sites only accept PayPal for payment; most offer instant delivery upon credit card approval.
The best way is to complete as many quests as possible and by killing as many mobs as you can whilst you do it.
One of the bulbs is out. Replace it.