Tips for Toasters: What To Say
Introduce yourself and how you know the couple.
Stories are nice, and fun, and charming, and so on; but be sure they are appropriate. Be sure to convey a nice image of the person or couple.
Have an ending. If it helps, think about your toast in reverse. You will probably end raising a glass and saying, “Cheers!” What are you cheering? Probably a long and happy life together (in your own words of course). The rest of your words should create a story for that toast.