Well, it all depends on your goal, but generally speaking I can assure you that once you get going you will feel and look so much better, that will be enough motivation to keep on going. You'll only have to push yourself for a few days and once you get the habit and see the results –in well being, energy level, strength and beauty- you will want to do it and you will love it. My recommendations are to pick a workout plan or activity you enjoy doing, if you are board while working out there is a big chance you'll drop it. Start with a short workout plan and do it while listening to music you like. Get a workout body, that way you'll make it more fun and you'll have a bigger compromise (not only with yourself but with your body). Introduce variety into your workout, don't do the same thing over and over again, that will keep you interested and challenged, and will get you much better results. Go for quality instead of quantity.
Best of luck!!!!