This is the link to Bob Hamilton's 7 part series on turning a square plate. Bob has a good number of tutorial videos on youtube. What I like most about his videos is that he talks you through the whole process. Technically this is a rather easy project, but be sure to mind where your fingers are at all times.
http://www.youtube.com/view_play_list?p=C8938CE91B063854
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Life's short, turn fast!
Dave