Download the bot here: zzukbot.freeforums.net/thread/2/zzukbot-mmaps
The client you can normally download via the server you chose to play on.

You place the mmaps in /Internal/mmaps in the bot directory.

The first time you run the bot you chose where the Wow client is, the next time it will start WoW when you start the bot.

Next you will need a custom class and a profile.
The custom class should be placed in Internal/CustomClasses and there should just be one for each class you want to play.
The profile has to match the zone you will bot in. It can be in any folder.

Once you have all the this, simply login to your character and chose "Run" in the bot window, this will prompt you to select the profile you want to use.