all you need is a wireless adapter which might be already installed on your system. Otherwise just get a similar one in the link below. Your school should have WIFI. If not then you will need what is called a wireless router that broadcast wireless signals to which you need internet service for also.

What kinda of laptop is it?
If its not that old then it should already be able to pick up wireless signals. If not you can just buy one of thesehttp://www.tigerdirect.com/applications/…

FIRST OFF IT IS GOOD IF YOU WOULD SAY WHAT BRAND YOU HAVE.IT MOST LIKLEY WOULD BE CHEAPER AND WORK BETTER IF YOU JUST GOT A NEW ALREADY WIRELESS SYSTEM,BECAUSE YOU CAN GET IN A BIG TIME JAM TRYING TO MAKE THE ONE YOU HAVE WORK WIRELESS,IT IS ALSO TO HARD TO BELIEVE WHAT ANYONE TELLS YOU HOW TO DO IT.PERIOD

1. What brand and model and age of laptop?
2. How do you know you do not already have wireless? If just couple years old you most like ly have a wifi card installed alreeady.