Changing Kitty Litter

[claw]

I'm a new cat owner so i don't really know too much about kitty litter. I know that you are supposed to completely change the kitty litter and pour in a new batch. I just have some questions about that.

1. How should i dispose of the old kitty litter?

2. How often should i change it?

I'm currently using a clay kitty litter but i'm planning on switching to a more environmentally and cat friendly litter soon.