Walmart has this great kit that will come with everything you need to start
It called Teach my preschooler,baby or kindergartner. I have two of them one for.
Or Dollar tree has a lot school stuff that you can use too.

I ordered some activity workbooks from amazon for reading, math, and science. I also brought flash cards, so far I’ve been trying to come up with a schedule similar to what she would do when she was in school. YouTube also is a big help