Custody Trials are cases decided by a Judge. A trial is a formal proceeding in a Courtroom. At a trial, the parties testify under oath. At a trial, you may present witnesses (persons who testify) and exhibits (documents) supporting your request for custody.
Prior to the actual trial, the Court will have a pre-trial conference to determine the date of trial, the witnesses, what documents will be presented at trial, etc. The parties should also update their Pretrial Statement.