Chances are that you will need more than one clay figure, in fact you'll probably need a small army.
Here's an inexpensive way to make 'clones' of your original sculpture.
Armature wire (1/16")
Van Aken Plastalina Clay
InstaMold Mold Making Compound
Baby Oil (Mineral Oil)
Double Boiler (or cooking pot and glass mixing bowl)
Paint and brushes
Imagination, patience and a video camera (optional)
Step 1: Draw your character!
For a full sized character aim to draw it about 9-14" in size.
In this tutorial Gromit (being a dog) was fairly short at about 9".
Make the drawing fairly simple, something that will be possible to sculpt in clay, and for which you can envisage a simple wire armature (skeleton).