I just wanted to stop by and say "Hi"!
I think some of the best encouragement/motivation that you'll find will be to look around at all the different people here--some of whom have more to lose than yourself, some of whom have less--who are all working towards goal on whatever plan works best for them. Probably the biggest step to losing weight is just deciding to do something about the extra pounds, and since you've already made that decision all you need to do is find something healthy that works for you! It may take a lot of trial and error so don't get discouraged if you're not perfect on your first week of a diet or plan... just keep tweaking things and trying new stuff until you find something that you can stick with! I think weight watchers is a great plan with a lot of support and I hope you like it.
Be positive and believe that you can do this! It will take time but if you really set your mind to changing your lifestyle and eating habits--even if it's in small consistent ways--you will see a difference!
Good luck with everything and welcome to the forums!