With fear and trembling approach the Chalice. Preparation is important, which includes, prayers, confession, fasting, and the abstinence from food from Midnight. For most, that means nothing is consumed until after receiving the Eucharist. Generally, fasting and prayer is addressed in the New Testament, and can be easily found. There are pre Communion prayers and post communion prayers for the repentant receiving Communion listed in most Orthodox prayer books. As far as the Midnight requirement that you address, I would hesitate to support a specific time requirement with Scripture, and do not understand the need to support a time requirement from Scripture.
"Therefore whoever eats this bread or drinks this cup of the Lord in an unworthy manner will be guilty of the body and blood of the Lord. But let a man examine himself, and so let him eat of the bread and drink of the cup. For he who eats and drinks in an unworthy manner eats and drinks judgment to himself, not discerning the Lord’s body. For this reason many are weak and sick among you, and many sleep” (1 Corinthians 11:27-30).
“I give counsel to everyone among you, whether man or woman, whether great or small, to anyone of you that may be guilty of sin, convicted by your own counsels, that first you must repent and confess your sins, that you may dare, considering yourself unworthy, to approach and touch the Divine Fire Itself. For our God is a consuming Fire, and they, therefore, who with faith and fear draw near to the God and King and Judge of us all, shall burn and scorch their sins; and It shall enlighten and sanctify their souls. But It shall burn and scorch with shame, the souls and bodies of them that draw near with unbelief. Therefore, many among you are ill and sleep in sickness, that is, many are dying unconfessed and unrepentant” (Homily on Holy Thursday).