The first episode of naruto talks a lot about cloning. They are training to do bunshins (clones) and Naruto sucks at it. First episode he learns how to do a shadow clone.

A couple rules about it:
Imagine the chackra (energy, ki) going through you and creating another you.
Take two fingers from each hand and put them like a cross in front of you.
Yell "kage bunshin no jutsu!" (
Shadow clone techniques)
When having two desperate bodies they act just like you would have wanted them too because they are a perfect split conscious of you.
When you unsummon them whatever they saw felt or experienced is now in your memory as well. So you technically control two at once, but not quite the same feeling.

Naga to controls six bodies at once though. And they share his mind. Might be more to what you are looking for.