I'm putting together a montage of video clips...What i want to do is add a selection, i'm fine with cutting and joining, but between the clips i want to add some sort of transition... So i may fade to the next clip, or something like that.

The second thing i want to do is take out the current audio and replace it with a new one...

Can someone explain to me how this could be done, or direct me to a site that would by usefull...Also, what software might i need to do this ?

thanx