Hi Deeksha,
Read the above mentioned link and the article....most probably will answer all your ur doubts...what is not covered there is....something about physical activity...
Not necessary u need to go to zym to loose weight....that provides a positive environment and u will get like minded friends....and a complete body workout....
If you can do walk/jog whenever time permits may not be that useful...one thing wt i hv understood it is all about deliberate practice....and need to do it every single day...like brushing our teeth...we never miss....
Let me throw some light on couple of physical activities what u can do at house and that can help u manage ur weight....
¤Climbing the steps
¤skipping
¤push-ups [many diff types one can perform]
¤squats
¤lifting the light weight
¤crunches
¤pull-ups
¤leg rise
¤cycling in a laying down position
i can go on and on....whatever mentioned above will really help to u do loose fat, gain muscle and manage ur weights....
Do let me know about the progress and difficulty u r facing...all the very best...keep it going.