Briefly, in chronological order leading to DL
Baking the bread: usually the priest doesn’t do that, but the Faithful do, either in turn, or on special occasions (memorials, etc.) the traditions vary a lot on this, to give an idea:
Prayers said in preparing prosphera (the bread used in eucharist)
maryofegypt.orthodoxy.ru/Prosphora/Prosphora.htm
a site on various recipes, aspects of the traditions of prosphera, etc.
prosphora.org/
Many churches on their web site have information on the prosphera, as it is an important ministry of the Faithful. Some things in common is the purest ingrediants are use, if possible, the tools in making it should be reserved for it, the loaves are stamped with a Cross and the inscription “IC XC NIKA” Jesus Christ Victory (the cry of the martyrs), maybe the large triangle for the Mother of God, the nine trianlges for the orders of angels and the saints, and some others triangles for memorials (living or departed). this is all for the next, the proskemedia.
The fasting we talked about above. For the priest I think it might be from Vespers, at least midnight. Maybe Fr. Ambrose can fill more in here.
The lay prayers before communion vary, some examples:
pages.prodigy.net/frjohnwhiteford/communion.htm
prayerbook.riewe.com/p28.htm
saintbarbara.org/faith/prayerlife/prayer_communion.cfm
they all have in common prayers of the fathers, psalms, self examination, confession, asking of forgiveness from others, etc.
the same sites have the prayers after communion too.
I again am note sure to decree, if any, the vesting prayers and proskomedia replace these for the priest.
the clergy do say special prayers, the kairon, when they approach the sanctuary, before the icons,etc.
sourozh.org/web/The_Divine_Liturgy%2C_Page_1#entranceprayers
Btw, part of these prayers, as you will see, the priest asks forgiveness of the Faithful (he does so again during the DL, the response varies: we say “God forgives. Pray for us father.”)
The vesting goes with prayers (mostly psalm verses) said as each article of vestment is put on. The idea is to depersonalize the clergy and present the office he is performing
oca.org/OCchapter.asp?SID=2&ID=91
sourozh.org/web/The_Divine_Liturgy%2C_Page_1#vesting
The proskomeida (the Liturgy of preparation): the loaves are selected (in some traditions five, for the multiplication of loaves) and then there is a series of prayers, including Gospel verses and from the prophets (e.g. Isaih when the square IC XC NIKA is cut out and John verse on his testimony being true about the blood and water out of His side).
stseraphimschurch.org/articles/proskomedia-e.html
sourozh.org/web/The_Divine_Liturgy%2C_Page_1#prep
Unfortunately there was a better video from a Greek Church I believe in Florida (St. Stephen’s?), but I can’t find it now. A pariticle is set on the patten for the Theotokos (the Queen on the right, I think the verse is from the Song of Songs), one for the forerunner the 9 ranks of angels, the martyrs (listing a number), confessors (listing a number) our Fathers in the Faith (listing a number), our mothers in the Faith (listing a number), the hierarchs, etc. and then all the departed and living to be remembered. A particle. For each one (I’ve heard of services where the patriarch had to cut a thousand particles, naming the person as he placed his individual particle on the patten).
For some reason, I have always been touched by the fact that if the bishop who ordained the priest is living, he is the first commemorated of the living, and if departed, the first of the departed.
In any case, you end up with a patten that has particle representing the Church triumphant, suffering and militant on the pattern.
THEN the DL begins.
Hope that gives you some info.