Woohoo the fact that you're excited about losing weight means that you'll do it easily 10Kg in 12 weeks is totally achievable. They say you shouldn't lose more than 1KG a week or it starts to affect your metabolism - so make sure you don't go over that.

How are you going to do it? Diet and exercise? If you are going to get specific about portion sizes and KJ's etc then i've got some info on your Basal Metabolic Rate (BMR) which is really important in weightloss. It's basically the MINIMUM amount of KJ's you need to eat to sustain your body at rest. It's important to have a rough idea of what that is so you don't eat too little and freak your body out!

Just let me know