Get yourself some Super Sculpey and start messing around with it and trying to create recognizable shapes, looking at pictures, trying to recreate in 3D what you see, trial and error, but always with the drive to want to achieve something special. Not all can sculpt... but it harms no one to try to find out if you have the skills.
Post here and ask for critiques. Start small and not like me... throwing yourself right into the advanced stuff... though... that can be fun too. But try to learn the basics first:
Tools.
Concept.
Preparation - wireframe skeleton structure that is strong enough and don't buckle. Twist it so the sculpey has something to grip onto, so it doesn't slide back and forth. Build up wherever you can with tin foil to save sculpey.
Execution.
Don't let negative comments get you down - always hope for constructive criticism... and even the bad can be helpful as it may help you to better the sculpt or get better in the future. Grow thick skin and always be proud of what you create, as anyone can be a critic; not anyone can create.
There are a lot of tutorials over at
TheClubhouse