selling prepackaged food usually requires a USDA approved facility. start there and figure 100-159k for the kitchen. You can't sell cooked meat that has been packaged in your own vacuum sealer. It must be commercial. But like I say the kitchen comes first.
This is a case where pleading ignorance of the law could get you in a world of trouble and of course shut down your wifes business as it's being done under her business license.
Retired competition cook. BBQ mentor.