I think these will be of great help to you. It is a 3 part tutorial.
http://www.youtube.com/watch?v=tGvwk7QySkY&feature=c4-overview-vl&list=PLB938A0B345928EDB
http://www.youtube.com/watch?v=n9R5gq9QEAo&feature=c4-overview-vl&list=PLB938A0B345928EDB
http://www.youtube.com/watch?v=Le3Z-Cs9X44&feature=c4-overview-vl&list=PLB938A0B345928EDB
