Define your lesson plans (or at least your subject areas, if you lean toward unschooling). Once you know what you want your child to learn, you can start to identify learning materials.
Consider using some of the prepackaged curricula offered online and through mail-order catalogs. These can be lifesavers for first-time homeschoolers, as well as a starting point for more experienced parent-teachers.
Shop book fairs and school supply outlets for thematic units and mini-lesson plan kits. Once you've got the basic curricula, you can incorporate your child's particular interests and learning needs.
Consult with the public school in your district. School reading specialists, librarians and other key personnel can be invaluable resources to guide your curricula selection. They may even provide your child with appropriate grade-level textbooks to use at home, if you choose.
Check with your local homeschool organizations for opportunities to swap books, language tapes, software and other curriculum materials with other parent-teachers.