Welcome to this site and with the skills you possess as mentioned by you in your post, you are at the right place.
This is a big site and you might have taken a tour of it and seen the various features here. You can start by posting some interesting posts in the forum section and start a discussion here. Please remember it is basically an educational and knowledge sharing site so try to be near that objective as far as possible though you are at a liberty to start a discussion on political, social or other miscellaneous matters. Refrain from personal comments and unsolicited personal advice from your side and enjoy the healthy atmosphere here.
Though there are many avenues here but you can begin with Article Section, Ask Experts Section, Information on Schools, Colleges, Exams, Question Papers etc and responding to articles written by other members.
ISC has a strict policy against copying of material to and fro it's site and one has to submit one's own compositions here.
You can submit articles in your core area and you will be getting points as well as cash credits for them from 20 to 120 or even more depending upon the quality. You can go through some articles here to get a feel of that.
In the Ask Expert section, you can answer the relevant questions and get some points as well as cash credit from 1 to 12 or even more if the quality and coverage is good. You can even ask your questions here which were puzzling you so long and experts here will try to answer them.
In the forum section, you will, in general, get some points only in the range 1 to 5 for each post as well as the response you make. Every week some outstanding threads get an award of 40 to 60 points as well as same cash credits.
Besides this, there are some contests coming up time to time where members can participate and compete to get cash awards in the range of 50 to 200.
Every month there is award of Rs 500 for the star of the month and Rs 100 to Rs 250 for super contributors and wizard of the month in the different sections.
So join in and let us share our knowledge with each other.
Knowledge is power.