In a very basic sense the Divine Liturgy (DL) is in 2 parts: the 1st part is the Liturgy of the word (preaching) & the 2nd part is the DL of the Eucharist. The first part culminates with scripture readings (usually chanted) of a NT espistle (usually St. Paul) by a deacon, subdeacon, layperson & then the Gospel reading chantedby the priest (at least in our Antiochian church) & then the homily. The second part is preparation for partaking of the Eucharist preceded by the hymn of the Cherubim, the Creed, the Lord's prayer, a general confession & then partaking of the Eucharist. Actually, there is much more but with some variation I believe among different Orthodox Churches.
In our USA Antiochian Church, most of the DL is in English although we rotate at various weeks through hymns with fair portions of an archaic Arabic, a little Slavonik, & a little Greek. So for ex. during the Trisagion in the first part of the Liturgy, we will hymn "holy, holy, holy.." in English one week & "Quduson, quduson, quduson.." in an archaic Arabic another week.