Another marshal might be in charge of all equipment, books, and paraphernalia, borrowing it, if need be, setting it up, and putting it away. There are no hard and fast rule about processions. Many go in what is called indirect precedence, that is, those of greater dignity and rank at the end. It is also customary in some traditions to place the thurifer after the crucifer. Sometimes it is effective to have the marshals of the various groups in procession right ahead of the groups so that they can be led to their places.
Some traffic direction is usually necessary.
Opening rites It is probably best to keep them simple. Perhaps use the acclamation, skip the collect for purity, and then have the opening song of praise and the collect. The song of praise, sometimes the Gloria, should be familiar and easily singable for all present. On occasion, it can be sung by the choir alone. The MC should direct the readers to the lectern as they are needed.