you will have to connect thru multiplayer option in-game... generally there will be two ways to play online - you can browse for online servers in the game itself or if you know the ip of the server (from sites like game-monitor.com or v-street.net) you can add the server ip to your 'favourites' and connect to it in-game.
I suggest that you atleast buy Counterstrike 1.6 from
www.steampowered.com or from local stores.. it's just around 350 ~ 400 Rs. There are lot of online players (many play from cafe's etc..)/servers in India for CS 1.6.
_