My reply is incomplete. The full answer should continue as follows.
When the charges are in proper form, the party alleging misconduct should disclose its supporting evidence. The tactical burden shifts to the other side when the charges have been finalised, and all the evidence has been disclosed. The other side may then respond and, if necessary, call evidence in rebuttal. The burden of proving remains on the party alleging misconduct throughout. The case will only be established if, at the end of the hearing, the evidence shows that the allegations are likely true on the balance of probabilities, i.e. guilt is more likely than not.
The principles I describe above are based on notions of simple fairness. Without rules that modify them, the common law will require their application.
The problem with the current proceedings is that they have, as I understand it, been framed in such a way as to exclude a review by a judge for procedural irregularities and unfairness. The club will have to trust its vastly experienced team of lawyers to see that the proceedings conform to these basics.