To connect to internet you need PC, a mobile,data cable (you can use bluetooth also but it give slow speed), PC suite or mobile software which you get in CD when you buy phone. I know in most cases people have all the things that i mention except PC suit or mobile software.
Here are the links of websites from where you can download your PC suite or Mobile Software
Once you downloaded your PC suite then installed it and connect your phone to computer . When we connect our phone to computer we got 2 or 3 option in phone like webcam,pc connectivity,com port,mass data etc, we have to choose pc connectivity/com port/modem/pc mode. Then a window will open in pc and ask for driver installation, just click next,next and you are done. Then follow the instruction which is in your PC suite guide. And finally you will get connected a connection notification will look up in task bar at the left bottom of your pc. Now you can surf ,download internet on pc. Remeber activate any internet plan before using internet . There are many internet plans starting from Rs 5 to thousands. If you are using first time then activate smaller internet. When you know the full procedure of connecting mobile to pc then choose plan according to your use.
If you are facing any problem in downloading PC suite for your mobile then leave in comment.