Your Save The Dates should match the overall theme of your wedding, and if possible, your wedding invitations. Because save the dates are not a part of your formal invitation set, you have more flexibility in terms of how much creativity you can exercise. Postcards, magnets and photo cards are all acceptable save the date options.
This is all you need to include on your Save The Dates: wedding date, your names and location. However, you may also wish to include travel information if you are having a destination wedding or have a lot of out-of-town guests. A link to your wedding website will keep the guests updated on the wedding related happenings.
Mail out your Save The Dates 6-9 months before the Wedding Date.