Formal instruction isn’t necessary for kindergarten, maybe not even helpful, maybe deleterious.
The entire world is your free resource. Children are natural learners and will gather mounds of knowledge if you take them out to explore.
Mandatory kindergarten is only a couple generations old and there is a resurgence of young children being educated by their families.
If you’re nervous about your responsibilities, please reach out to me or a local homeschooling group.
I assure you can do this.