Ipod virgin

[Osiris]

Since my goal is to use this device in my 370, i thought i'd post these questions here. And yes i did search before making this post Anyways, i'm basically an Apple hold out. I don't own any Apple products. Up til now i've been using a simple USB 32gb memory stick to play my mp3's.

I've been looking at the Ipods, Nano's, Touch, etc.. I'd like to be able to play video on the NAV screen from one of these devices as well as music. So with that, here are my questions:

-Which of these Apple products play video?
-What kind of connector do they use? And will it work in the Z?
-What music format does an Ipod use?
-Will i need to convert all my gigaquads of mp3's to some other format?
-Can i simply copy and paste my mp3's onto the Ipod?
-What video format does an Ipod use?
-Can i simply copy an .avi or .mpg to an Ipod? Or will it need to be converted?
-If conversion is needed for audio or video files, what application does this?
-Do i have to use itunes to do any of this? If so, do i have to pay for it?
-If i'm able to play a video from the Ipod onto the NAV screen, will the video playback stop when the car is in motion like it does for dvd's?

Thanks for any feedback!