Is this a fast, effective way to lose weight?

I am worried about my weight just recently. I am 16, 5ft7 and weigh about 145 lbs! I am thinking i will start eating a lot less of only healthy foods and no junk at all. Each day i will do 30 minutes of vigorous aerobics and 15 minutes of jumping rope. Will i lose weight? How much weight will i lose over what period of time? Which parts of my body will become toned etc? Any tips or suggestions to lose weight faster? Thanks heaps :)