Or you could keep it simple.
Draw out the profile of a butt stock to scale with buttplate, cheek piece, and lower molding included, and then run off some copies. These blank templates are useful because well designed carving flows in harmony with the shape of the stock and the position of the other features.
Use these as your canvas.
Then pick some designs you like from originals or contemporary work and practice drawing these on to your stock templates.
Believe it or not, with repetition your drawing skills will improve and you’ll also begin to notice more quickly the errors or problem areas of your designs.
This is what worked for me. Hope it can help you too,
Jeff