There are several ways on how to make a wireless , internet or old lan cable connection between two pc's .
Wireless works if you have a modem at home . Ask your operators via phone or mail if they can set up a wireless connection for you at home so you can hook up any pc's or laptops to a special single use IP ADRESS ( 192.155.bla bla bla etc. ) . If you have a online website for making a wireless connection for yourself , then all you need to do is log in using your username ( ITS USER OR ADMIN ) and password ( LOCATED UNDER YOUR MODEM ) .
If you don't have a modem , are very far away or you don't feel like going to talk to your operators you can choose Internet . Usually you will have programs like Hamachi . Hamachi is free and really awesome for some Lan play .
All you need is your Ip adress , and a password ...
This doesn't really need to be such a big topic . Plug and Play , simple as that!