You should start speech with an introduction to yourself, how you are related to the wedded couple and how long you have been known to each other. Do not drag the introduction part to cover your details only. You better keep your introduction a line or couple of sentence and focus on the couple more, because they are the integral part of the speech.
Share An Important Moment/Story About Couple
After introduction towards the middle part share a good positive story about the wedded couple. You can also share an important moment of their life, which brings them into the limelight in front of the guests.
Share Good Points of Couple
You can extend your speech in the middle to share some good points about the wedded couple with the guests. It can be about their student life, career or even family life. It can be possible that the couple had been together for sometime before the wedding and have good memories of those days.
Include Parents' Support
You can add a bit information about the parents for their support to the newly wedded couple, and might share a couple of good points of them being wonderful parents.
Thank Guests, Organizers
At the end you can thank all the guests for attending the wedding reception and all staff who have taken care of food and other arrangements on the day.
Propose Toast for the Couple
Before going any further you should propose a toast for the newly wedded couple. This is a good gesture to wish all the best for the wedded couple, and soon you propose it all the guests participate in the toast.