Baptism is an initiation into a community, so it follows that those seeking baptism would participate in community life.
Since your child(ren) is/are old enough to understand what living life as a baptized Christian entails, they will take part in a special process of being fully initiated by receiving the initiation Sacraments of Baptism, Confirmation, and Eucharist at the Easter Vigil, just as they did in the early church. The length of time depends on the readiness and dedication of the person seeking baptism.
The goal of the process is to develop a real relationship with our God that will express itself in love for our neighbor. In some cases, it may mean changing attitudes, habits or lifestyle.