I need help!!

My son is 3 years and 1 month and is not interested in toilet training in the slightest. I've brought him a fancy potty, toilet seat, cool jocks with wiggles, buzz lightyear etc on which he picked himself - but if I put them on him he crys and says he wants his nappy on!

I don't want to force him because I don't want him to be scared of the whole process, he's not afraid by the toilet or the potty, he just prefers nappy's.

Has anyone got any tips for me?