Research on what's happening in actual preschools and apply that to your homeschooling curriculum. At 3 years, kids usually learn about recognising alphabets, numbers, counting and basic phonics and verbal skills in order to prepare them for kindergarten. There are plenty of homeschooling material online as well as in the stores that you can refer to. Alternatively you can join homeschooling groups online and see what other parents are doing, how they are coping and find out about what can and cannot be done. If you are based in Singapore, try: homeschoolsingapore.sg