A table plan will be good just to ensure your guests can easily see the design or layout of your reception seating arrangment. It is an inherent part of the wedding decorations
Table plans can have all kind of styles and formats, there is no rule other than making it easy to read and understand.
One idea is to have different cards with the table numberor name as header and the name of your guest that were asigned for it on the bottom.
You can also have an easel with a floor plan and on each table have printed the name of your guests.