I think the best way to “raise kids Catholic” is to first, live your own faith - go to Mass on every required day and on non-required days too when you can; pray the Rosary or other Catholic prayers regularly and daily; have things like a crucifix, picture of the Sacred Heart, statue of Mary and saints, etc. in your home and venerate them; make sure that you talk about/ explain the religious aspects of holidays like Christmas, Easter, even Halloween/ All Saints, as well as the holy days of obligation; be kind to others, give to charity, volunteer, don’t express bigotry or racism in your daily life, encourage your kid to also give to charity and help others, etc. And do this stuff as a family. Don’t just send the kids off to Mass by themselves and expect them to be grown-up Catholics at age 13. As Katie said, they aren’t ready for that no matter how mature they think they are.
Setting a good example is about 2/3 of the battle. If the kids see the parent not bothering to practice faith, then it doesn’t seem very important.
The other thing I’d suggest is to get the kid into some peer group where sacraments and other Catholic activities are done as part of the group. Someone above said “get them to see Catholicism as normal” and I think that is really important. I grew up in a really Catholic area and went to a Catholic school where 99 percent of the attendees were Catholic and it was much more important to all of us at age 14 that we be in step with our peer group than wrestle with any kind of apologetics regarding our faith. There will be time for that later, probably in college.