What do you teach a kindergartner at home(homeschool)?

I am exploring homeschooling and I would like to know what to teach a 4 year old boy. He already knows all shapes,colors,numbers to 20,alphabet,letter sounds,his name,recognize many sight words so I think he is ready for kindergarten but they won't accept him until he will be 5 (that will be in 2 years since he is born in Sept. 19 ) I don't want to wait 2 more years but I am not sure what exactly he should learn . Any ideas or suggestions for a cheap but good curriculum ? Thank you !