Don't drink any protein shakes, diet shakes, creatine, etc when trying to lose weight.
I recommend a 1400 calorie diet...you can get a good amount of nutrition from it if you avoid empty calories such as chips or chocolate (empty calories == calories that don't really have any nutritional value). The biggest thing I can suggest is avoid HIGH FRUCTOSE CORN SYRUP. 40g of high fructose corn syrup is far worse than 40g of sucrose(table sugar) because it releases hormones that immediately store it as fat. Sodas contain a high amount of high-fructose corn syrup and I believe one of the side-effects of high fructose corn syrup is that it makes you hungry again.
I lost quite a bit of weight myself and I recommend you take a multivitamin along with this diet. If you want a snack take a fruit but don't overeat! I've noticed a part of losing weight is feeling hungry...you'll start to get hungry but it doesn't mean you should necessarily eat a meal, but rather, eat a fruit (be careful with fruits and veggies...some contain a surprisingly high number of calories like bananas have around 100 and avacados have like 300...google the calorie count of your fruit...I believe orange and apples have a low amount and make you feel full).
If you start eating sandwiches make sure that they contain vegetables too and not just meat + light mayo + cheese. You're going to need to take a lot more vitamins and minerals (unless you're currently eating a heckload of empty calories).
I gained 5 lbs over winterbreak from eating when I wasn't hungry and I just lost it all back by eating just when I was hungry (like 3.5 meals a day).
I cannot emphasize enough to avoid empty calories.
In addition to dieting it is good to do cardio. I usually do 30 minutes of cardio but I started at 20 minutes and made my way up. After cardio, go get your lifting on. The caution about lifting though is after you lift you get insanely hungry and may be tempted to eat a 4th or 5th meal. Avoid this as best you can.
If you have any questions feel free to ask

If you start to feel lethargic or weak, immediately quit this diet and see a doctor/nutritionist about an appropriate diet.