I need help for downloading music videos into my new ipod classic 160 gb

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I have this new ipod classic and i desperately need to know how to download some of my fav videos into it also i have to know that will downloading new videos delete the videos that i already have in my videos section.. I have already downloaded videora ipod classic converter. and right now downloading the quick time player. please help as i don't know much about these stuff and bcos it is a very expensive piece i don't want to make any mistake Only who have knowledge of this may advice.. thankyou