I guess it depends on what you want to do... character, objects, so on... like do you want a person or a cheeseburger or an elephant or...? Haha! I try to divide the object into shapes so that I have as little sculpting as possible.
I'm curious to see what you decide to do, let us know and we can give you ideas. Unless you wanted an idea of what to do! geez... am I blowing this now?
Try making Mount Rushmore! That would be neat.... and plenty of sculpting!
Here is my third cake, and you can see the shapes it was divided in. Rectangle base, square (cube) body, tube neck, round head. Put it together... You have Jack!
Pound cake or a cake with pudding in the mix is best. Something dense. you can add pudding to your cake mix as well. Also you could freeze the cake to make sculpting easier. Good Luck
Thanks for the hints. I want to make a doll. I would like her in a sitting position, with her legs out in front of her. I want her arms down, but not glued to her sides...Similar to the pic (excuse my drawing!)
Should I make her arms out of cake? Gumpaste?
I cut a paper towel roll about 4 inches long for a mold, wrapped it in Saran Wrap and buttercreamed it. Then I wrapped the fondant around and tucked in the ends.
When I do Jack again, I am going to add gumpaste to the neck fondant and use the roll for a mold again, but let it harden first so that I can remove the roll.
Just for clarification, the neck doesn't support the head in anyway. I used a dowel for support and at the top the is a piece of wood that his head rests on.
I soooo wish I had pictures, but again it was a surprise for my wife and couldnt take any. That is why I am going to make a second one with detailed pics.
Hope that helps, if you want to know more I would be happy to answer! 
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