Make Videos | Audio Files | Programms

I am sorry for this question again.
I just want to know how to make my own video clips. Wich Programm i should use and how to get it.

And quite the same question about audio files.
How to get them formatet into wave or MP3?
How can i open them?
Wich Programm do i need? And where can i download it?


Thx for answers, i love this Forum

Ok i know this has been postet somewhere, but i haven´t found an answer that satisfied me yet.
So please tell me what i have to do get to do this?