The best way to get started is to find a local Catholic parish in your area. Call the church office and let them know you are interested in learning more about the Catholic faith. Remember there is never any pressure to become Catholic, but also remember the entire Catholic community keeps you in constant prayer as you discern.
There is a beautiful and ancient journey called the Rite of Christian Initiation of Adults (RCIA) that will lead you through many stages of learning and growing in knowledge of the Church. Read more about the RCIA.