Great to see this, I lost 5 stone ( from 19.5 to 14.5 stone) last year, the 1st two weeks are the hardest, I used an app on my phone called myfitnesspal, you can log what you are eating and it gives you a calorie guide based on your weight and your weight loss goals.
I stuck to 1600 calories a day made up of 50% protein and hit the gym 4 times a week, lost around 2 pounds a week but totally changed my body composition.
Stick at it and you will get there, the main thing it perseverance, if you do fall off the wagon one day just forget about it and make sure you do well the next day.
Good luck guys