If possible get a receipt for its delivery. You have no further legal obligations or duties. You have no risks, financial or otherwise. You may be interviewed for clarification of the contents, but you are not personally pursuing a private criminal prosecution. You are simply doing your duty and laying information.
Subsequent action is up to the magistrate.
The media will be told at the same time. If you have time, and the resources, we invite you to make several copies of the document and ask your friends and other supporters to complete and deliver them as well. The more the better. But involving others is not essential. Throughout the day, scores of others were being handed in at magistrates courts elsewhere.