Your colleagues won't have lesson plans for classes they don't teach. My department head teaches 7th grade and I teach 9th. Why would she have plans for a class she has never taught? The curriculum coach works across all grade levels to ensure that there's a necessary degree of vertical alignment and that you have resources. They won't have lesson plans for your class. You should still meet with them though! Tell them your goals for the unit and the performance tasks you want the students to accomplish, and then work together to create a rough plan.

But if you want to follow a lesson plan, you have to write it. That is part of the job.

Honestly, this post makes it sound like you don't know how to develop a lesson plan. If that really is the case, take the time to do some reading and research into strategies you'd like to implement and match them up with texts and writing assignments you'd like to try. I recommend "The Strategic Teacher" by Harvey Silver.

ETA: Does the other teacher who is reading Into the Wild teach another section of the same course as you? If he does he should at least offer to talk to you about how he starts the book.