As a Seton student, I can’t help but point you in SETON’s direction. I love the school to death. The work is extremely hard, but it’s well worth the effort.
Seton will send you all of the books you need, along with a course manual. In the lower grades, there is a little less structure. However, as you get in to middle and high school, you have to follow strict schedules, or you will get behind. As the teacher, you can eliminate some home-graded work (they give you an answer key), but you cannot eliminate anything that is sent to them for grading (quarter testing and such). Here is their website:
Also, I urge you to contact a homeschool group in your area. Lots of them have email groups. Getting into contact with other homeschoolers in your area is the best way to make it less scary.
catholichomeschool.org/findgroup.php will help you locate a local Catholic homeschool group in your area, if there is one. Even if there isn’t, you can still contact the nearest one and see if they can provide you with any other info.
We also use Catholic Heritage. We’ve used the Kindergarten curriculum and will continue to use it next year as well. I’m not so sure about secondary, as my husband will probably want us to switch to an accredited program, in anticipation for college (which is about a million years off)