Losses very depending on amount of weight you need to lose and other factors but they say its 1-2lbs a week? I am used to kgs, in KG it is 1/2 to 1 kg a week.
You can drink alcohol, you have weekly points that you can use for what you want and you can use it for snacks or dinner out or a glass of wind.
I am not hungry on WW, I have been doing the plan for about 3,5 months now. I love the freedom it gives you. You can go to a course or follow it online, from home, and they have an app you can use to calculatie your points. Fruit and vegetables are mostly point free which means they are 0 points.
good luck making your decision.