Also, it's beneficial to remember the active life style throughout the day to boost your burnt calories / metabolism: take the stairs, stand instead of sitting, do small exercises / stretches etc. here and there, take breaks to stand up and exercise a bit if you're sitting for long... not entirely what you asked about, but just throwing it out there, not something to overlook!
http://www.menshealth.com/fitness/high-intensity-cardio-workout-thats-easy-your-knees?cid=NL_WeightLossNL_1915082_1117204_Module2
Now get going!!