This planning page is incredibly useful for jotting down ideas when grasping the main criteria for your unit planning. Since unit planning requires compiling extensive data and information from more than one cumbersome document, having the "bones" of the main idea on one place is often helpful for reference.
This particular planning sheet places the unit standard(s) (TEKS) dead center, allowing for you to plan with the end goal in mind: student mastery of the learning objective. Move outward to focus on the important parts of that objective as it's written, and consider what other standards may need to be bundled. From there, move even further out, compiling data from former test administrations, lesson plans, district unit documents, etc. to consider the most crucial inclusions for your unit.