Use
Celtx, it is very cool especially for collaboration.
Too many people expect artists and animators to work for nothing, they even will pretend they have a budget and extract as much as possible before the hapless creative fool has to move on to another commercial minefield.
Meanwhile these artists have to fork out for extortionately priced software (esp. PS and Painter)
(anime not included of course) just to keep in the game.
Please jotoon, don't join the ranks of the exploiters,and don't rush into a project until you have some resources.
Good you luck (sincerely) on your project I hope it works out for
everyone involved.
If however you get a budget, have a decent story and the art looks good you are welcome to give me a yell, I will gladly help out on that basis, if of course I am not too busy.