What soundcard, and what modules are loadet, and are you using alsa, and what permission is on /dev/dsp and /dev/audio ?
What type vid card, and what settings are you using (refresh rate/pixel depth/etc) ?
What type WIFI card do you have ?
http://madwifi.org/wiki/Compatibility for madwifi cards, see if yours is listed there.
As for prism54 based cards (http://prism54.org/fullmac.html), at this stage it is quite a mess which are supported, and if theres beeing worked on support for those, but a stock kernel should have buildin support for atleast the fullMAC types.
If it is a madwifi supported one, then you might need to fetch the latest madwifi-ng and build it, but once we know what type it is, we'll take it from there.
For using wireless, I suggest you'd get wireless-tools installed and take a closer look at iwconfig/iwpriv, as those are the main commands used in setting up WIFI connection.