I know this might seem like far away already but something to file away in the back of your mind is coming up with a way to organize all your "thank you's". Over the months leading up to your wedding and on your wedding day you will get getting several gifts and cards. It's very important that no one slips through the cracks and doesn't get a proper Thank You.
You need to come up with a system to keep track of each gift or card and who it came from. You don't want to miss anyone when you start sending out thank you cards or emails. It's also better when you can be specific about your "thank you's" and not just send a generic, "thank you for thinking of us".
A personalized card or letter is always the best. You also want to mention the gift. For example, "Dear Aunt Suzie, thank you for the cash gift," or "Dear Fred, thank you for the serving dishes". Your guests will understand that your wedding day is hectic and the days after almost as busy but at some point they will start to get a little upset if they don't hear from you. Providing each individual with a proper "thank you" card or letter is imperative.
You can ask your Maid of Honour to keep a record of everything when you are opening presents or one of your parents would be happy to help. If you miss something or thank someone for the wrong gift it can really hurt some people. You don't want to do that especially when a little bit of planning ahead of time can keep that from happening.
Whatever system you decide to use please take it seriously and make it your goal to start your married life with a sense of gratitude.