Take a deep breath and know that you are not alone. There are as many ways to homeschool as there are families homeschooling. Most families find value in joining with other homeschoolers. Time with another homeschooling family or at an activity sponsored by a support group can go a long way toward relieving any anxieties that might crop up. Many children also like to see that they are not the only ones not getting on the school bus.
Few families find a perfect match with a prepackaged curriculum.
However many families find the ease and security of prepackaged lessons a great place to start, especially if coming out of a traditional school setting. See the end of this page for curriculum resources. In a nutshell, to do a unit study, you pick a subject, any subject, then go to the library, search the house and call your friends and family for resources about that subject. The ocean, famous inventors, any country, any period of history, genealogy, religion. The list is as endless as life.