Building individual skills is the key to success with middle school bands. For many decades, outstanding programs have used a "pass-off" system to motivate students and build skills logically. Rather than reinvent the wheel, start with what I used and modify it to fit your needs. The entire document is saved as Microsoft Word, making customizing it for your band easy.
Want to see a sample first? Here it is.
You'll get the exact system I used to build high-quality band programs in different communities and the ability to modify it to fit your needs.