My dear friend, let me first welcome you back home. The thing to remember about confession or if you will the Sacrament of Reconcilliation is that it is a sacrament of mercy not a sacrament of punishment. If you have been away for awhile you should know the following:
Most churches today have a confession room, not the dark phone booth type things you may have been used to. The confession room is arranged so that when you walk in you will see a kneeler and screen and usually a chair that is facing the priest. You can make your choice of confessing by kneeling down at the screen so that the priest cannot see you as you may remember from the past or you can go around the screen and sit in the chair and confess face to face. It is your choice on how you want to do it. But we are getting ahead of ourselves here.
Before even going to Church to confess the first thing you should do is to ask the Holy Spirit to help you remember your sins. And you should make an examination of conscience which is a fancy way of saying think about your life and figure out where you went wrong.
When you are ready to go to confession make sure you tell the priest that you haven’t been in awhile. He will help you to make a good confession. Be honest and truthful, remember that this is a room filled with mercy and you are there to claim your share. When you are done confessing, the priest will offer some suggestions to help you mend your life. He will give you a pennance, a prayer to say or an action to complete, and then he will ask you to “say an act of contrition.” This can be the formal prayer you might remember from the past or it can be a spontanious prayer you make up that expresses your sorrow for sin and your resolve to try to avoid it in the future.
Then he will pronounce the words of absolution and bid you peace. Generally I say “thank you Jesus and thank you father.” as I am leaving. It is then a good policy if your pennance is to say some prayers, that you do so before leaving the Church. I also spend a few extra minutes thanking Jesus for forgiving me and asking for grace to avoid sin in the future.
Again, welcome back! I really hope this helps. Don’t be afraid of confessing your sins in this sacrament of mercy, be afraid of what could happen if you don’t. Peace to you my friend.