congrats on taking the first step towards the lifestyle change ,
to lose those extra kilo's you need to burn up for more then what you put in
Doing weights is reasonably energy intensive and burns a fair amount of calories.
Doing weights will burn calories longer than cardio - with cardio you only burn calories while you're doing cardio, weights last much longer after you've finished your workout. Weights sort of put the body into overdrive so even a few hours after your still burning calories
IF you're going to do weights, stick to the big compound exercises - squats, deadlifts, bench press, shoulder press.. they use the biggest muscles in the body (multiple muscles)
with your cardio , don't go doing anything too intensive , due to your weight you could do more damage then good , start off with a brisk walk