I would prepare by striving to live a sacramental, prayerful life and learning what we believe as Catholics.
This would include:
- getting to daily Mass if possible
- visiting an Adoration Chapel often, if one is available.
- praying the Rosary daily and
- going to the sacrament of Confession on a regular basis.
I would also read and study the Catechism
of the Catholic Church as well as the writings of the Early
Church Fathers, the very first Christians, who lived from 100 A.D. to 800 A.D. The best version
I know is Faith
of the Early Fathers, a 3-Volume set by William Jurgens.
I would also find a priest that could be a spiritual advisor for
you. Make sure he is loyal to the Holy Father and Church's Magisterium.
If he isn't, dump him and ask the Lord in prayer to provide you with
a solid priest.
You will be in my prayers.