It's great that you are thinking about baptism (sometimes called a Christening too). The information on this page is mostly about having a child baptized, but if you are an adult who is interested in baptism, the best first step is to email
Baptism is the beginning of an amazing journey of faith for your child. It's an important and joyful occasion where it's lovely to have friends and family present. Baptism is part of your child joining the church and so the baptism should take place in your local church.
Before the baptism you will need to be sure you know what is going to happen and the church will help you prepare for this. If you are interested in doing some initial reading about it, please look at https://churchofenglandchristenings.org