Share 'Retirement fund for an S Corp owner'

Hi My wife and I are the only 2 shareholders of our S Corp which we set up for her business. I would like to set up a retirement fund that is pre=approved by the IRS. Do you guys have any recommendations on that? We still haven't paid her any salary yet, but our objective here is to save on taxes as much as possible. I realize that we can do that by making her contribute to a retirement fund and…