Hope this helps!!!
http://bakedecoratecelebrate.com/techniques/rose.cfm
Are you able to take any Wilton classes. You don't say where you are at (from) If you could take a class with a great teacher you would be able to understand how to do different flowers. Or hey just a thought how about a video or dvd on flower making. Wilton has some for sale.
For buttercream flowers:
http://www.cakecentral.com/article25-Getting-Started-with-Buttercream-Roses.html
http://www.cakecentral.com/article50-Making-Buttercream-Roses-on-a-Stick.html
http://www.cakecentral.com/article56-How-To-Make-a-Buttercream-Poinsettia.html
http://www.sugarcraft.com/catalog/misc/lessons/basiclessons2.htm
http://www.wilton.com/decorating/basic/index.cfm
And for Xmas, Xmas trees:
http://www.cakecentral.com/article55-Ice-Cream-Cone-Trees-Great-for-Christmas-Cakes.html
HTH
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