Here is a great youtube tutorial I used once to make my own fondant but I did not have great success either. The video is actually Way Beyond Cakes By Mayen.. not sure how it ended up on another site.
http://www.easy-cake-ideas.com/marshmallow-fondant.html
But I buy my fondant and I have been using Satin Ice. I know a lot of people say it dries out on them, but I usse THE MAT from sweetwise and it is so easy to roll and keeps it moist. I usually buy it from Global Sugar Art but Sweetwise also has decent prices. I have heard a lot of people say they use Fondx too. I think my next cake I am going to try it.
