lose 30 lbs

I just added this to my list. Im still pretty new here. But anyway, I managed to lose about 10 lbs in about a week. I switched my diet to nothing but turkey sandwiches on whole wheat. I admit though, I do use a bit of miracle whip, some mustard and a slice of pepper jack cheese. I think its time to add in some kind of workout though. I think Ill pull out my Dance Dance Revolution pad and play a few games a day. It keeps track of what youve done in workout mode and calculates it into how far you ran or swam and even how many times you jumped rope. Toss in some situps and I should lose another 10 right?