If you are new to Orthodoxy these links can provide some great information for you:
What we believe: The Nicene-Constantinopolitan Creed
“Twelve things I wish I’d known” before attending an Orthodox Church article
In order to maintain dignity and reverence for the Holy Eucharist, remember that our Holy Communion is the culmination of our Liturgical Worship and our personal spiritual life. Thus, we must not think about receiving the Body and Blood of Christ in isolation from the rest of our Christian Life. For us, regular prayer, confession, fasting, and stewardship, as well as attending the Divine Services and being on time for the Liturgy, constitute proper preparation for Holy Communion. If you are not Orthodox, you may receive a portion of the blessed bread. If you have any questions regarding Communion please speak with Fr. Andrew.