When you are home you connect both the phone and your laptop to your home wireless. Don't do anything out of the ordinary at home.
When you are away from home and want to use your laptop but don't have wireless, you turn on the mobile hotspot feature on your phone and connect your laptop to the phone. When you turn on the mobile hotspot there are options as to what password you want. On the laptop you'll connect to the hotspot labeled as your phone name, enter the password and you should be good to go. The phone will light up a status bar saying how many devices are connected. Once you are connected your laptop will be using cellular data from your phone.
Hope that clears some things up.
Sent from my iPhone using Tapatalk