First, I would need to know more about what kind of workout you’re going to do. I do high performance cycling (HR > 135). For that, I like to eat a light meal consisting mainly of complex carbs before a workout. Pasta salad is my favorite thing to eat before and during a ride – if I’m going to ride more than 40 miles, I need to eat during. If I’m planning a long ride, 100 miles or more, I like to carbo load the night before. Avoid foods that are high in protein, like meat, eggs, and fish, before a workout. It’s harder for your body to metabolize these foods, and you generate more urea as you process them. Hard on the kidneys when you’re working out at the same time, although you DO want to eat these foods after your workout to provide protein to build muscle. But eating carbs after you workout will replenish muscle glycogen, aiding in recovery. Drink lots of water. I can’t overemphasize this. If you like sports drinks like Gatorade, dilute them with water to cut the sugar. They have a lot of it. All supplements are do-do. Eat a balanced diet, and you’ll do fine.