Sorry to hear the bad news mate!
Download myfitnesspal and start counting your calories! It doesn't matter what you eat as long as you don't exceed your daily callri intake! You need to be on acalorie defacit.
If you need help calculating then drop me a pm
IM BEEN USING THAT ONE MATE THANKS AND REALLY HELPFULL,ALSO INCLUDES YOUR STEPS FOR THE DAY AND GIVES YOU MORE TO PLAY WITH BUT IM TRYING TO STAY UNDER THE 2000 AND JUST BEEN TO GYM AND SPOKE TO A PT AND HES GIVEN ME THIS WEBSITE FOR LOW CARB STUFF,SO WILL GET THERE