Where can I find what the Catholic Church officially teaches about the Bible and Tradition?

There are a number of places you can go. First, look at Vatican II’s Dei Verbum, the Dogmatic Constitution on Divine Revelation. You can find this document in the front of many Catholic translations of the Bible. You will also want to read Pius XII’s encyclical Divino Afflante Spiritu. Examine also the Council of Trent’s Decree Concerning the Canonical Scriptures.