I have never covered an entire cake in fondant, but want to try. I need a good instruction tutorial. I'm not sure how to smooth it out and if it wraps under the bottom of the cake or you just cut if off even with it?

You can look on youtube, there are a lots of good videos, just type covering cakes (round and squares) with fondant. You will need fondant smoothers and pizza cutter. If you are using home made fondant, you need to pour powdered sugar when you are rolling the fondant and not to roll it very thin because it can cracks.. Sorry on my not so great english, hope i helped you

Youtube is a good place to start. You will find correct instructions on using fondant.

Thank you for the advice. I will check it out. And good to know about the powder sugar and thickness.