Mike, this isn't a tutorial, but it is an online segment calculator. It's actually quite good. You just have to know what you want. http://www.delorie.com/wood/segturn.html
I use WoodturnerPro and I am very pleased with it. There is also some good plans in the plans section. The Tahoe Turner book Ron mentions is very good,that guy is amazing! The Art Of Segmented Wood Turning: A Step-by-step Guide by Ray Allen is very good also.