1. In itunes there's the ipod icon on the left and underenath it there's the music icon. Click it, search for the song you're trying to deleet, click it and press the delete key..
Of course, you may need to connect the ipod to your computer before..
It takes mp4, 320×240 etc. Google ipod converter or something.
Of the free ones, this one
is one of the best I think.
Yes. Again, click the music/movies/TV shows icon, right click the seelct item, click edit info.