wireless network

I AM A STUDENT AND HAVE HELP OUT MY LOCAL SCHOOL TO PUT IN PLACE A ROAMABOUT WIRELESS NETWORK,MY QUESTION ONE: HOW DO I SHARE THE INTERNET CONNECTION CLIENT TO THE LAN IN THE CLASSROOM.
QUESTION TWO:THE SCHOOL USES ALL 98SE SYSTEMS WHO DO I SECURE THE SYSTEM WITHIN THE SCHOOL,THIER IS NO SERVER IN THE LOCATION.