I found this handout which includes useful language for debating for ESL students: https://www.teflsites.com/Expressions%20for%20Discussion%20and%20Debate%20new.pdf
In order to make this huge list more manageable, I selected some of this language that I could put on one sheet (double-sided) to print out and give to my students.
My document: docs, pub.

I'm indexing this with my material on debating practice, and with my general TESOL material.