a. Guide to the Divine Liturgy, Robert Krantz
b. The Divine Liturgy – The Orthodox Faith, Fr. Thomas Hopko, Vol. 2 (purple), Chapter 5, p. 153-198 or https://oca.org/orthodoxy/the-orthodox-faith/worship/the-divine-liturgy/the-divine-liturgy
c. Podcast: Worship in spirit and truth, Fr. Thomas Hopko, an excellent series of… 84 episodes. Listen at least to the first ones! http://www.ancientfaith.com/podcasts/spiritandtruth
Note: keep this text handy and use it weekly as you prepare for attending services. Do not allow it to become a distraction during the liturgy.