I'd say eat every two or three hours with a protein-rich meal. Carbs aren't really going to help you much if you want to build muscle, so high protein, good fat (butter, fat in meat etc) will help you. Then, get your carbs from veg, salad etc. [protein will build your muscle after a workout and fat/carbs will give you energy].

Workout: make sure your technique is right, as you can be doing a whole host of different exercises but if your posture is out or your technique isn't great then you could be wasting a lot of time. Free weights are generally better than using machines etc.

And always consume a protein-rich meal after your workout.