I think that sounds like a great plan for you!!!
I'd keep track of everything in your lose-it app. and check your status in 3-4 weeks or so. I'm sure you will see a difference! Just remember we don't measure everything just in pounds lost; we use our clothes fitting better, our blood pressure getting better, so many other measurements to check our success!!
Definitely get in your 64oz of water/tea/coffee, you will feel great well-hydrated plus you will need it for your exercise too. A diet coke here and there won't hurt either, don't make too many drastic changes at once!
Good luck!! I look forward to reading about your success!!