I know you've said its just a start but crash dieting down on 1200 calories per day is not a good way to start at all, also shakes only is really not ideal either, its extreme and unsustainable. At the peak of my cut my lowest intake was 1650/1700 and im a pretty short guy so my calorie requirements were lower by default.Been trying to lose a few kg, get down to ~78kg from 86kg. Spend this year trying to do it by having a half decent diet but I've not really been disciplined enough so have gone on the Myprotein Whole Fuel shakes, got a month's worth and will see where I am at the end.
Hopefully it'll get me some of the way, currently on 1200kcals a day, but will have some snacks Fri/Sat night (crisps and humous is my go to!) and one proper meal every weekend so it isn't too miserable a month.
Wish me luck!
A much better habit is to go walking every day for 45misn to 1hour. Start your calorie limit at 1.9k cals minimum.