What are the necessary steps one must take to become a mail carrier?

I would like to become a mail carrier, but don't know where or how to start. I'd like information on tests, study guides I'd have to read, interviews, where and how to apply, basically any and all info about how to get started with becoming a mail carrier.|||www.usps.gov you can start as a casual meaning temp then if you do good and they like u they make you perm there is a basic ability test you must pass