How can I get fit fast and easy?

I'm a girl and I was wondering what can I do to get fit so my body, mostly my stomach area, can be skinny and hard, kinda like abs but for girls. I'm not really fat, I just want to lose my little pudge I have and thin out my thighs because they are a little bigger than I want... My problem is, I haven't been trying to workout only because I don't have a workout schedule and healthy diet planned out. Can anyone please help me? Thanks! (: