I've got the above, what i'd like to know is how do i stop anyone else apart from my household getting access to the internet from via my router - as in neighbours or people outside the house
While setting up you will be offered two types of password encryption WEP and WPA. For a personal router most people prefer the WEP option. Just click on that and you will be given a space to enter your password. Be very careful to write it down somewhere, so that you can re-enter it at a later date if needed.