hello to everybody.

i'm new with the linux, and i have some questions because i have some "problems":

i have a internet connection (adsl), that it's arrived in a computer with slackware via ethernet, and i have another 2 computers with vista (one for my wife and another for my boy). how can i make a little network and to give internet from my computer with slackware to both computers with vista, via wifi ? what i need a wifi router or it will work only with the usb wifi adapter ? and the most importaint, how to configure the slackware to give internet to both of computers with vista ?

thanks and i hope that somebody will help me.