To connect to the internet using a wireless connection then 1. You need a wireless adapter on your laptop which most have unless it is old. 2. You need to be in range of a wireless signal that has Internet connectivity. If not then you might have to use a wireless broadband modem or something like that.
Depends on a dozen things, is their a free wi-fi service available , is your wi-fi turned on and searching for a free connection, are you trying to connect to a wireless connection, if so do you have your wireless modem connected and is it lighting up , how about does your area have a good signal? You have given us very little information to work on so it does make it hard to offer and good advice.