Reddit mentions of The English Teacher's Companion, Third Edition: A Complete Guide to Classroom, Curriculum, and the Profession

I second the motion to wait a year and get to know the kids and program. Also, it's good to get to know the political climate a bit and to build some networks of support with people who will be willing to put in a good word for you. Build a rapport with the kids who will tell their friends about you.

Meanwhile, use your year, which might be fairly easy, to do the following:

Here are the ELA state standards for OK. Get to know them like the back of your hand. Know which years are generally the same, and which years take a jump forward in expectations.

Read some books about how to teach in an English classroom. Write Like This and Deeper Reading from Kelly Gallagher will give you concrete strategies you can use for any grade. Some of them you could even do with mixed groups of mixed ages. Jim Burke's English Companion is also good.

While you have time and a fairly mild workload, plan, plan, plan. Put things on paper. Look into how LMS's work (my personal fave is Schoology, and I've tried at least a dozen different ones over the years) and what they can do for a classroom where kids have computer access.

Don't get discouraged if, after all this, they say no. What you have then is everything you need to walk into any regular classroom 6-12 if you decide to look for a new job. Good luck!

The English Teacher's Companion by Jim Burke might be along the lines of what your department head is suggesting. It gives practical tips and tools for teaching secondary English.

The English Teacher's Companion, Third Edition: A Complete Guide to Classroom, Curriculum, and the Profession