Join Fr. Rob has he answers some of your questions, including: How many angels can dance on the tip of a needle? and Do I always need to say an Act of Contrition in Confession?
O my God, I am heartily sorry for having offended Thee, and I detest all my sins because of thy just punishments, but most of all because they offend Thee, my God, who art all good and deserving of all my love.
I firmly resolve with the help of Thy grace to sin no more and to avoid the near occasion of sin. Amen.