Tips about weight loss and diet?

My goal is to lose about 15-20 pounds by the end of this summer. I know it is healthy to loose no more than 2 lbs a week. I started working out for the past 4 days, and burn approx 1,000 calories at the gym per day, along with other exercises. I also cut down completely on fast food (which I go to only at the most, once a week) and have incorporated fruits and veggies into my diet. I started drinking a lot more water. I do the elipitical for an half hour, then the stair climber for 20 minutes, I do ab crunches several times throughout my workout, the bicycle for 20 minutes, and then the elipitical for 30 minutes. Is there something I should change in my workout? Also what are some aerobic exercises that are easy to do? Finally what are foods that will help me loose weight. Should I stay away from pasta, I have heard contradicting theories on pasta and carbs, so I’m not sure if pasta contributes to weight gain or not.