Christian/Catholic schools!

Hello everyone! I have a son and I'm catholic and I'm considering putting my son on a catholic school because we're just very religious people. He won't start school until next year he's barely 4. But I've always been curious and Ive wondered how those schools are? I would like to know for those who have had the experience of going to one. What do you like and dislike? Did your parents pay a lot or was it free? I want all the details! Thank you in advance.