I have been to a couple of Masses like that recently, although the vigil is the norm sometimes it is done at other Masses. There’s always a good reason, not just personal preference.
The Mass is as normal until after the homily when any baptisms are performed, followed by the confirmations.
For the confirmations the candidates request confirmatio, pprofess their faith and then go forward to the Bishop, or in certain circumstances a priest who is given special permission from the Bishop, for the laying on of hands. The Mass then proceeds as normal until communion when those being received go up first.
There is typically a rehearsal or preparation session just before the day and there will be order of service booklets in the church on the day, saying what to do and when, as well as reminders during the Mass itself.
The best person to talk to is your priest, if you haven’t already. He is the one who knows exactly how it is done in your parish, there can be variations. And of course he needs to arrange your preparation for the sacraments.
It is wonderful to hear that you are coming home, I’ll keep you and your family in my prayers.