Acts 8 and 11 are describing Confirmation which is in addition to Baptism. This in no way negates the necessity of Baptism. In Acts 8 it explicitly says that they were previously baptized. In Acts 1 Jesus is foretelling the descent of the Holy Spirit at Pentecost. It is because of this descent that the church can administer the sacraments and teach with authority. Welcome to the Catholic Church!
As you can tell by my comments, my conversations with the Priest are quite unusual. Funny how he asks permission if it is OK to discuss my comments with his spiritual mentor!!!