Position molded fondant pieces on cake. To attach to fondant cake, brush back with water. Fondant trims can be placed directly on buttercream cakes. Finish decorating using buttercream icing.
http://www.wilton.com/decorating/cake-decorating/covering-shaped-cakes-with-fondant.cfm

And here’s the link to the section on decorating with fondant, including making flowers and people, etc…
Hope it helps!
http://www.wilton.com/decorating/browse.cfm?cat=Fondant-Gum-Paste

Take some fondant and add a little water just enough to make the fondant thin, smooth and sticky. the thinner the better.

Use a pastry brush and apply a very thin layer on the decoration itself then apply to cake.