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Is this a good (healthy) weight-loss eating plan?

I'm 19 and I'm looking to lose about 30 lbs all together. I know about the fad diets and such and that is NOT what I want...that's why I'm asking for some advice. I am going to be exercising, starting out cardio 3 or 4 times a week for at least 30 minutes, and when I've lost the weight, I'll begin weight training to get better toned. Although I'm focusing on calorie intake, I've all together cut out sodas, sweets, and obvious things like that. Anyways, here's the eating plan I've been following, and it will change from day to day, but same amounts, close to the same amount of cals and such.

Breakfast:
1/2 cup Instant Oatmeal - uncooked - 150 cals
2 Tbsp Smucker's Organic Strawberry Preservers (for flavor) - 100 cals

OR

1 container Dannon lite and fit vanilla yogurt - 60 cals
1 banana - 110 cals

*1 or 2 bottles water (20 fl. oz) - between breakfast and lunch

Lunch
1 medium sweet potato - up to 150 cals (?)
1 Jennie-O turkey hot dog - 70 cals

*1 or 2 bottles water (20 oz) between lunch and dinner

Dinner
1 chicken breast (4-5oz) - up to 140 cals
3/4 cup (maybe more) green beans - 30 cals
1 bottle water (20 oz)

NOW, I realize this is only around 650 calories at the most for the day, BUT, not every day will be like this. I'm at college, and I go to the cafeteria sometimes. So, at least one meal a day will have, probably much, more than 200 calories. Also, I've heard about the 5-6 meals a day thing to keep your metabolism going. First off, is this right? It makes sense. I've been going with it, and having, usually fruit, or like those 100 calorie pack foods for a snack. So probably two snacks a day at 100-200 calories. I think that said, it will amount to at least 1200 calories a day. I would appreaciate ANY advice on this. I've talked to a couple people who are pretty knowledgeable, but put this together on my own. I know with a good diet and exercise, the weight will come off. Maybe slowly, but surely Thanks!

*Crystal Light? I know the artificial sweeteners...10 cals per packet, but is it alright for a diet? I get tired of water so easily..I can make myself drink it, but with crystal light is MUCH better! At the most, I'd use it on two bottles of water a day.

Thanks again!
To Daniel: I know the amount needed to lose weight is different for each person...is 1500 the minimum? I had been told 1200 was. Please correct me if I'm wrong! And thanks!
Thanks Fred! I don't like many vegetables, but I'll definitely incorporate the ones I do! And thankyou..didn't know the 1300 calorie thing. Milk..I could do a glass in the morning..chocolate milk is a weekness though. Haha..thanks again! Great answer!