There is no single dietary program that works for all people. You must eat 6 - 7 meals per day and each one should contain protein and carbs. Don't allow yourself to get hungry. Keep your appetite in control with smaller meals and healthy snacks in between.
In the quest for your goal, diet supplementation is the last of the elements that you need to add to your regimen. Multivitamins, protein, glutamine and depending on your goal a creatine or weight gain product and a fat burning product are great starts. Supplements make it much easier to get the necessary nutrients to build muscle and can even give you an advantage and enhance your training when taken right and combined with a good diet. Keep in mind to check with you physician before you take some supplements
Make this a start to your new 2010 lifestyle and remember there is no quick and easy weight loss or muscle gain program.