nothing. it just a ceremony.
yes
Any marriage, which takes place in the Catholic Church, is valid. When one wishes to marry, one should contact his local priest; the priest will give instructions to the couple and the non-Catholic must agree to raise the children in the Catholic Faith. If the priest determines that the intentions of the couple are in union with Church teachings, he will permit the marriage. However, if one were to marry outside the Church...the Marriage is not valid.
The Roman Catholic Church does not recognize remarriage unless the couple was married outside of the Church. The nature of marriage is such that it can not be unbroken. Therefore, an annulment is not a divorce, but rather a recognizing that a marriage never took place. If some couple were to have their marriage annuled than they were never actually married and their "remarriage" would be their first. A widow or widower may marry.
The why of 'have to marry outside the context of Mass' is crucial to a proper answer. Even then, its a question for a priest. If it's a 'have to' because the Church would determine that the union is illicit, the Church does so in believing one's soul could be at peril.
That depends on the laws of your country and the policy of the church in which the people want to marry. As you have not provided enough information about these things we can not help you further.
Yes, he could, with proper paper work. There has to be a valid reason.
No. A marriage between an Orthodox Christian and someone outside the Christian religion will not be blessed by the Orthodox Church and will be grounds for excommunication (barring from the sacraments).
The civil marriage would not be recognized by the Catholic Church and the couple would need to have the marriage blessed by the Church.
The wedding arch or arbor, chuppah is meant to replace the alter when a couple chooses to marry outside. It is a long standing Jewish tradition that the marring couple have something to kiss under. The Chuppah, arbor, arch fall into play and take the place of the alter inside a church or Temple.
No. They do not need to be ordained but they do need to represent a church or religious organization to do so.
A Catholic cannot marry outside of the Church, this means that in this time this person has been living in sin, living conjugally outside the bonds of marriage. This Catholic would need to repent and go to confession before receiving Holy Communion.