A big subject. One of the differences as highlighted in the other thread would be original sin and which as I explained Orthodoxy sees somewhat differently. Adam sinned and the whole of humanity shares in the consequence, which is death. We do not hold to belief, however, that we all share in the guilt of Adam's sin.
Yes, we do have confession. The mysteries (or sacraments to use western terminology) are baptism, chrismation (or confirmation in western terminology), holy communion (which are the sacraments of Christian initiation, always in that order, and administered also to infants), confession, marriage, annointing of sick and orders.