If you have never been baptized with water in the formula "I baptize you in the name of the Father, and of the Son, and of the Holy Spirit", then this is your path toward Catholicism:

If you have been baptized outside of the Catholic Church with water in the formula "I baptize you in the name of the Father, and of the Son, and of the Holy Spirit", then this is your path toward Catholicism:

If you have been baptized within the Catholic Church with water in the formula "I baptize you in the name of the Father, and of the Son, and of the Holy Spirit", then this is your path toward becoming fully Catholic: