You have to make sure that any product groups you want to see in FOH are added to the Menu that you are using. More then likely you will only have 1 menu unless you are setting up breakfast, lunch and dinner menus. Menu Groups are used for multi-station installs where you would like to see a different menu on different pos stations. Please see this video
When you create a new job code make sure that job code has the Manager Access Level assigned to it.