Just found a great set of instructional materials on the Church year and how to use the books for each. From Holy Transfiguration Monastery Publications. It's a treasure trove.
(HTMP) - Besides presenting Holy Transfiguration Monastery’s books themselves, this website was conceived to explain and illustrate what the Church books are and how they are used.
We begin with The Liturgical Year Introduced, a series of diagrams that show when the Menaion, Triodion, Pentecostarion, and Octoëchos are used throughout the year, the difference between moveable and immovable feasts, and how they work together...
Site available here.