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I did find a cook book on amazon that is called Deliciously Low, the gourmet guide to low sodium, low fat, low cholesterol, low sugar cooking. You may want to take a look at that, looks like it runs between $4-$8.
Vegetables and some fruits are your best bet along with lean low fat meats for the diet your are requiring. Tofu is something else you can look at. You can get fruit juices that are diet or low sugar to get and this is a good option to meet your fruit requirement for the day. Ocean Spray makes a lite and diet version of their fruit juices that are made with splenda instead of other artificial sweetness that are bad for you. Diet coke and hawaiian punch also has a diet version made with splenda.
lowsodiumfoods.info has a huge list of foods and their sodium contents.
Low cholesterol foods include fruits, vegetables, beans, egg whites, grain, poultry, fish, milk, yogurt and cheese.
Low sugar foods are a little tricky, besides sweets and sodas you have to be careful with some fruits and vegetables. Low sugar fruits include lemons, limes, raspberries, blackberries & cranberries. Medium sugar fruits include strawberries, blueberries, melons, peaches and apples. Low sugar veggies include spinach, broccoli, asparagus, cucumber, cabbage, mushrooms. Stay away from corn, potatoes and peas.
Low cholesterol includes lean means such as poultry, lean pork and fish.
Hope this has helped. Have a good day.