Let's say I've got an album downloaded on it and I've also got the covers to go with it... but how do I put it on iTunes? Is it by adding it (cover) the same way you would an album or song?
You can also do a global add by going to "Advance -> Get Album Artwork". This should go through every song you have searching for album art you do not have and download it from iTunes.
The best place for high-quality album artwork (600 x 600 or greater) is http://www.albumartexchange.com/
The best place for high-quality album artwork (600 x 600 or greater) is http://www.albumartexchange.com/