Importing/editing FLV file from pc and making dvd

Hi everybody... new Mac user/owner here... virgin sorta hehe.

I am an internet broadcaster who has to stream via pc. Once I have finnished show, I need to get said file in to my Mac and edit with Imovie...I think. I have been trying to do this with toast8.4 but everytime I make a dvd with toast... IMovie only can see files ads FLV and won't open.

Any suggestions for this rookie would be appreciated

cheers