Your answer should not be just to have a classical education.:) While having a classical education is important, here are some ideas to consider:
Do you want your child to translate authentic Latin Literature? If you do, you want to make sure they are learning their grammar and vocabulary for their entire Latin career. You particularly want to make sure they are strong in verbals and in ablative usage. Start your student in Latin knowing that you want them to get to the real stuff (the good stuff, in my opinion).
Are you using Latin to teach them study skills? Then make sure you are assessing them in how well they are studying. Tests, quizzes, et cetera are important. Make sure you also have them set up their notebooks properly.
Are you using Latin to solidify your student's English grammar? You might want to consider reading books like A Latin student's guide to English Grammar while doing Latin with your student.
Are you using Latin to help your student learn more English vocabulary? Then you want to get them a good dictionary and a vocabulary like mine (you get the first 15 Lessons of Henle when you sign up to be a site member of my website. You want to teach them the Latin vocabulary then as a way to figure out English.
Latin is such a worthwhile endeavor! It can be used in so many different ways as a tool. My recommendation is to start your Latin Program with your goals in mind.