OK: here, on a Tuesday morning, is a complete lesson plan on the personal pronoun in the nominative case.
I begin this lesson, after a class change, with this Cultural Literacy worksheet on Jargon; and if the lesson, for whatever reason (there are many in classroom, as we teacher know) continues into a second day, here is a second do-now, an Everyday Edit worksheet on Booker T. Washington. Incidentally, if you or your students find Everyday Edits useful or edifying, the good people at Education World offer a yearlong supply of them for the taking.
This scaffolded worksheet on using the personal pronoun in the nominative case is the mainstay of this lesson. Finally, here is a learning support on pronouns and case to help students navigate this area of usage and develop their own understanding–and mastery–of it.
If you find typos in these documents, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.