In order to bring a lawsuit against someone or file a criminal complaint you have to have standing to do so.  Standing is the legal authority to be able to file the complaint or bring the suit.  Although you may have standing, I highly doubt that you do.  The owner of the restaurant has the ability to sue the former employee or file the complaint.  You can, though, be the one to appear as a legal representative of the restaurant (you can be given an affidavit or POA for this limited purpose).  Your name can not just be the one in the caption to bring the suit on behalf of the restaurant.  And if it is a corporation then the corporation has to be the one suing.  Good luck.