While there are many preschool worksheets available, some are more useful than others in terms of versatility. There is a lot more to school readiness that just knowing the alphabet and counting to ten.
Do choose worksheets that are appropriate for the child's level, since children can get discouraged easily, if they are unable to perform the activity. Well illustrated worksheets with cartoons are also more likely to appeal to children. Worksheets that use common situations children come across at home, school, in the market place etc and that use common objects known to children would be more relevant.
Ideally, children who have been introduced to reading modeling behavior enter kindergarten and first grade ready and eager to read on their own. For most children, the formal teaching of reading begins in these grades. Most educators, homeschool or otherwise, use a combination of phonics programs, worksheets, and actual books to teach reading. These are all tried and true methods and can result in reading success. A relatively new methodology, syllabics, extends the focus of phonics programs on the sounds associated with the consonant letters to simple rules for correctly using the variable sounds associated with the vowels.
Worksheets that include topics such as social and natural science will help to expand your child's horizons, teaching them about their environment and how things work, while improving their vocabulary at the same time. A worksheet about farm animals can initiate a visit to the farm area at the zoo, or to a real farm, where your child can explore and learn even more.