Multiboxing does help you get gear but it is not as simple as that. Be prepared to go from being ecstatic to just pissed. You have to relearn how to play not only in the outside environment but for instances. Traditional methods and strategies do not apply.

If you are adept at making macro's and basic software configuration you will have less of a learning curve otherwise there is quite a bit of trial and error. The good thing is if you read these forums and more importantly the wiki you will be able to learn from others.

I know you want to equipment one toon but you really need to equip the others as well as you progress deeper and deeper into the instances. And no you do not just simple follow a main or visa versa. They are a team and if you plan on getting equipment of any substance you will need to learn to play all the classes at once. I prefer to have the main as a tank and the rest DPS/heal