Potty Training!!!

I can't even begin to potty train Lainey! She has NO interest at all in going to the potty! I have bought her boys underware with Cars, Nemo and Toy Story on the. I got her girly panties with Tinkerbell and friends. I bought her a tiny floor toilet and a Cars one that fits on the regular toilet. She absolutley refuses to go. I am frustrated and at my wits end! Anybody have any suggestions???? I would apprecitate any input. I know she will eventually go, but she is almost 3 1/2 years old!! What do I do?