itunes limewire playlist

when I move my limewire to itunes over and load it on my ipod my ipod is completely full?
Is there a way to start a new collection limewire file share then I can have new songs on my iPod without it being completely filled with old and new songs. I prefer not having to go through 1000 songs in my itunes and the limit down. leading to long term. I'd rather be able to start a new file sharing limewire playlist. and so when I moved my itunes i could combine the new songs and the songs I want in a playlist. how do I can do that?
It is easier to playlists in iTunes, then simply add or remove items as they want. You can then just select the playlist you want on your iPod.
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