First off I just want to say it's fantastic that your attitude is way up there and want to wish you all the best with your weight loss.
I just wrote a post, and I think there are some things in there that would be beneficial for you to read.
You might need to do some additional googling to supplement this information, and the amount you can safely lose per week for your individual body composition. I would love to see a success story, and having gone down the route of the shake diet myself, I would really like to share my perspective with you!
Hope you'll find something useful in the read. Good luck in your journey anyway