Spin casting (as I know it) as actually pretty easy. The equipment however, is pretty expensive - for lost wax type casting, anyway. I did centrifugal lost wax casting in jewelry and metalsmithing classes in high school...been wanting to get back into it but the equipment costs have me stopped cold.
Check out any website that caters to jewelry making/casting techniques - the principles are the same. Heck - that's why I got into metalsmithing...it was like making models.