My first ever New Year's resolution was when I was 10 years old and it was to eat more fatty foods (I didn't quite understand the concept and it's funny how since then, it's always been the opposite resolution - eat less fatty food). However, I kept to my guns and that year put on around 5 kilograms, Oh how proud of myself I was.
I learned my first lesson then, make goals you actually want to keep and you will. If everyone around you is making a resolution to spend more time with their family next year and you personally don't enjoy spending time with your family, then don't make it your goal.
Start planning your New Year's resolution now, it will give you the time to look into future purchases, such as gym memberships and planning anything you need to help you succeed in following through, for example if you are trying to get a new job, update your resume now, so that when the New Year ticks around you will be ready to go.
The more time you give yourself, the more effort you can put in. Plus it's not just a future goal anymore, you are starting to put the wheels in motion now.
Set realistic goals so you don't let yourself down. If you want to drink less alcohol, don't make the goal "Quit drinking alcohol for the whole year", because you are most likely going to break it 2 weeks in. Make the goal something like, "Only drink alcohol 2 times a month", that way you can monitor yourself realistically and plan around that goal.
Believe in yourself and your goals. Start saying "I will succeed" rather then "hopefully or maybe I'll succeed". See the potential your goal has to offer you, even write it down, so you are constantly reminded of this.
Tell everyone you can, about your New Year's resolution. That way you will feel more pressure to pull through and achieve it.
Lastly, be excited. You want to enjoy the process, while it might be hard at times, you are doing it because it will lead to a better life for you and the people around you.
If you are having a hard time thinking of a good New Year's resolution, my standard goal every year amongst other ones, is to be kinder and more selfless. I think it's nice to always improve as a person every year.
Good luck my friends and maybe in 2013 you will find yourself having to make a New Year's resolution to stop being so awesome!