i think you have the right attitude in getting control of your weight before it gets control of you which i'm sure many others here would agree with
exercise is important, and like you said you do walk in the evenings which is great!!
personally i don't know much about the shakes so won't comment on them but there are quite a few people here who have tried them so should be able to give some good info. but i will say that making a change to the way you eat food (if that makes sense) will be important to keeping the weight off and staying in control of your weight long term.
Anyways, welcome and good luck in reaching your goals!!!