But if you return to me, and keep my commandments, and do them, though you should be led away to the uttermost parts of the world, will gather you from thence, and bring you back to the place which I have chosen for my name to dwell there. (II Esdras 1:9)
For from the days of your fathers you have departed from my ordinances, and have not kept them: Return to me, and I will return. to you, saith the Lord of hosts. And you have said: Wherein shall we return? (Malachias 3:7)
Wherein shall I return to the Church of our Lord Jesus Christ? 

First of all study the Basic Catechism.
Also recommended is the Roman Catechism, also called the Catechism of the Council of Trent.

Make the Novena to the Holy Ghost for guidance.

Then Make the Profession of Faith and submitted it to the Catholic Church




This is described in more detail with full explanations in this section!

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