Am I eligible to invest my money in share market if yes,than how can I ?
Well, you can definitely invest in share market ( Not sure if you need to be over 18 yrs to invest in shares, but I assume you are over

) . Easiest way I guess would be to open a demat account like icicidirect, sharekhan etc.
Rest of your questions like which shares to buy to get good profits etc ... I wish I knew
