ok now for a indepht explaination of how kage bunshin works. Oh and everything im about to say was already said in the manga.


1st - chakara is only made as it is used and comes from ones stamia or from the kyuubi's as happens to be the case with naruto.

2nd - the clones take a certain amount of chakara to make themselves and are supplyed as much chakara as is left over after making them when the jutsu was preformed.

3rd - even with the clones there is still one orginal to be found and the only one who can convert more stamia to chakara

Now the only thing i dont know is wether the clones can recieve more chakara after they've been created. Now i would say that they probally use chakara to maintain because we have seen the jutsu cancaled so with that i'd say they do use up some chakara while they exist after there made but i dont know. Oh and sorry for all the spelling mistakes.