Hi Savvy, You have made a great choice, good luck with it.
I am too on Lite n' Easy, I am on the 1800 calorie lunches and dinners, I just make my own breakfast which is either 2 slices of wholemeal toast with peanut butter or a small bowl of oats and skim milk.
For exercise do mainly, and a lot of cardio exercises, which is basically running, jogging, walking, swimming etc.
Drink over 1.5 litres of water a day.
Cut down your portion sizes, with Lite n' Easy, all the food is already portion sized so you don't have to worry about that.
Stay away from junk food, fast food, butter, most oils, fried food and soft drink.
maybe add in some light dumbbell/strength exercises such as Squats, Lunges etc.
Midnight snacks are a weakness for everyone but if you absolutely need to do it try having a big glass of water, or maybe, if you are on Lite n' Easy, put one of your snacks you get (if you get the lunches it comes with snacks) aside just incase you get up then you are still within your calorie intake recommendation for the day.
I have lost 32kg so far pretty much doing this
good luck to you!