My brother sinner, this is the preparation you must undergo before you repent and go to confession. Know firstly that repentance is a returning from the devil to God, which comes about through pain and ascesis. -- St. John of Damascus
Repentance is at the heart of the Gospel; it is the message of the Forerunner, of Christ Himself, and of the Apostles. The call to repentance is directed to those who already believe.
Generally speaking, there are three elements in Confession. Part 1 is feeling sorrow for sins committed. Part 2 is admitting what you've done and taking responsibility for your behavior. Part 3 is repentance, changing your behavior, which makes the forgiveness of sins possible.
The therapeutic method of the Church has the intention of transforming a sinner into a Saint. Holy Confession is part of the cure. But it must be followed up by repentance.
Either of these booklets will help you prepare for confession. Both are very good and offer a list of questions to help you examine your conscience. The first is based on the Sermon on the Mount; the second on the 10 Commandments.
The world glorifies a lifestyle of sin as glamorous and ridicules humility as a weakness. Life in the Church is the exact opposite. Humility is a great virtue for it opens to us the gates of Paradise. Our God established repentance as the way of salvation.