Reddit reviews The Companion to the Catechism of the Catholic Church: A Compendium of Texts Referred to in the Catechism of the Catholic Church Including an Addendum for the Second Edition (1997)
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There is a Companion to the Catechism of the Catholic Church which provides the source excerpts the CCC uses.
For a Bible, I'd recommend https://www.amazon.com/Didache-Bible-James-Socias/dp/1939231140, and the Catechism to the Catholic Church. https://www.amazon.com/gp/aw/d/0898704510/. It's a great Buble translation and has footnotes that reference the CCC which explains what the Church teaches and why. They're an excellent pair. As for Mass? Others have given excellent advice. As a convert myself, I found The Catholic Church to hold the fullness of truth.
God bless you in your search for truth.