Setting up an wireless internet security is a highly recommended procedure.
The best place to start is with your wireless router, and how that works.
The best way to secure your network is to hide your wireless router and change the default network name & password.
This prevents people scanning your network and trying to access it locally, which may give them access to connected systems.
The is easily done by accessing the router directly using the default 'ip address' shown on the back of your router.
The ip address will look like '192.168.1.1' type that in the address bar of your web browser.
When the router login page appear,s enter the default 'username' and 'password' shown on the back of your router.
Now things get a bit trickier to explain, as different routers have a different interface.
Have a look around and see if you can spot an option similair to one of the following :
'do not bradcast SSID'
'hide network address'
On the page where you find the above, there should also be an option to change the network password.
This is a good idea because some networks are given poor passwords by default.
It is also a good idea to create a 'guest' password for you wireless
network, this way you can allow friends and family to use your network
without compromising security.