[Two Part Answer]
Without going into the details of your case, or considering the possible final outcome, the procedure is this:
As I understand it from your earlier posts you have been summonsed to the Magistratres’ Court to answer an allegation of GBH (Section 20) to which I assume you intend to plead not guilty. This means a trial will be needed. As S20 is an “either way” offence (which means it can either be dealt with in the Magistrates’ Court or in the Crown Court) the first issue that has to be decided is where it will be dealt with. This decision will be taken in the Magistrates’ Court at the first hearing (unless there is good reason for the matter to be adjourned to a later date).
Magistrates’ courts are usually presided over by a Bench of three magistrates and no judge is involved. (Occasionally the court may be in the hands of a District Judge sitting alone but this is exceptional, especially outside London. Even if this is the case, the procedure is identical). The prosecutor will provide the Bench with details of the alleged offence. This is not given as “evidence” (that is, no witnesses are called, and normally no photographs or CCTV evidence is produced unless it is needed to help the court make its decision on the venue). At this stage the court accepts the prosecution’s version of events “taken at its highest” (i.e. its most serious). If the Bench decides the offence is too serious for them to deal with they will commit the case to the Crown Court (this will be done formally at a subsequent hearing about eight weeks later). If they decide to retain jurisdiction you have the option to elect a Crown Court trial.