To lose 10 lbs a month is a really difficult thing to do. With eating right and exercising moderately, you can definitely lose about 5 - 8 lbs a month.
To start off easily, try to cut back on the following:
Replace snacks with fruits and vegetables. Try to avoid fast food if at all possible.
I'm 21. I'm was 5'8" and 180, so I cut back on all junk food (including coffee...which is a downer...especially in college). I replaced my dinner with chicken breast + salad and I eat an apple later at night. I run three times a week (3 miles) and weight lift 3 times a week. After 3 months, I am down to 166.
Add some cardio into your workout 2 - 3 times a week. Walking, jogging, running, jump-roping, swimming, biking, etc. Are all good.
Also, add some moderate weight lifting. Muscle burns more calories than fat.
Let us know of your progress, and good luck