My name is ***** ***** I am a NSW Solicitor. Thank you for your question, and will do my best to assist you with your question. Please understand this is not legal advise Please understand this is not legal advise but a guide to assist you.
Firstly in these types of matters you do not file affidavits you give evidence in court.
You then get cross examined by the prosecutor and you also cross examine the police informant.
The court would have made the costs orders and told you.
You have 28 days to appeal the decision.
You should speak to the law society of QLD and have them refer you to a solicitor that practices in Criminal law.
Here is there website
The costs are in all states. Not just QLD.
You can also speak to legal aid and see if they can give you some advise on the decision.
Community legal centres also provide free legal advise.
I hope this makes sense?