its all about changing your lifestyle. you should take your doctors advice and start eating healthier. try to have 3 meals a day max.
a god healthy high fib re breakfast, cereal or toast with wholegrain bread. add plenty of fruit to your diet. seek alternatives to fried foods, egg, make oven chips instead of fried, fry an egg in the frying pan with water ins tread of oil or butter (this is essentially called a ached egg not a fried egg
you should have one big meal a day preferably diner, try to be a bit healthier with this meal but dint change it too much. make sure your other two meals are healthier with plenty of fruits and fib res, this way you ll not get bored of healthy boring food.
you should try and throw in some exercise every day, 20 - 30 minutes on exercise bike or treadmill. this will help you reduce your cholesterol, especially if you exercise with a balance diet.
see this article for more info http://www.bhf.org.uk/Keeping-your-heart-healthy/preventing-heart-disease/cholesterol.aspx