Please consider doing a LOT more research before you think about breeding your chis. They are both still young, so you have plenty of time to research and decide. There are just so many things to consider when breeding. I hope you won't take this the wrong way, but just because your breeder says the health of the parents is good is not enough. You need to have your chis checked thoroughly by your vet for any genetic defects at least.
I am not a breeder, nor do I profess to be an expert. But I do feel I have learned a lot about chis in the last year, and hope to continue to learn. We do have a couple of breeders on the forum, and perhaps they can give you more detailed information.