There are plenty of articles around on how to configure FreeBSD WiFi Access point but my setup was bit different since I wasn't bridging my WLAN with my LAN and I'm running pretty restrictive PF-based Firewall on that same machine.

Configuration files that I had to "touch":

• /etc/rc.conf
• /usr/local/etc/dhcpd.conf (this is for isc-dhcp3-server package that you have to install)
• /etc/pf.conf
• /etc/hostapd.conf

As a result I've got my WAP network up and running with exception of Ubuntu boxes that needed extra care to get WAP going. Mac OS X was ideal in this scenario picking up network just fine and requiring minimal intervention (that is - you still have to supply network name and password :) ).