I'm planning on giving my son this very PC that I'm typing on for Chrimbo as I will have built my new one by then.

I've read up in the 'net about networking and I'm a little lost on what EXACTLY is needed to set up a basic network which allows for the sharing of an internet connection.

I'm thinking that the wireless option will be the most straightfoward, but I need to check with those in the know: what am I buying for the PCs? Is it just a wireless router which wll come with all of the necessary bits or am also going to need to buy some kind of network card too and possible other bits too?

Pointers needed - help appreciated, thanks!