Great you are taking control.
Have you thought about using the 5:2 diet as a kick start? That's 600 cals a day for 2 days a week. It's the Fast Diet book by Michael Moseley.
It's worth a try.
My own way of keeping slim is to really limit all carbs, hardly any sugar and no sweetened drinks or snacks like crisps etc.
Not sure if this would work for you, but my average day looks like this. I rarely eat red meat so most main meals are fish or chicken.
1 or 2 poached eggs 1 slice wholemeal toast OR 100gms full fat plain Greek Yoghurt with berries OR 30gms porridge with milk, and berries
Lunch- salad with tinned fish or meat or cottage cheese
Piece fruit and yoghurt if not had any for breakfast
OR 300mls soup- fresh from carton or usually homemade
Dinner- fillet of fish (salmon, sea bass, cod, haddock) oven baked with some fresh veg ( 2 portions at least), or stir fry ( only 2 tablespoons rice) , lean meat and veg, roast chicken dinner, homemade shepherds pie,
Piece of fruit
I allow myself 1 square of dark choc a day.
At a weekend I might have a small portion of a pudding but during the week I don't eat cakes or biscuits.
If you are starving have an apple or orange - only about 60 cals and quite filling.