The slightly unobvious part (unless you try man man) is :
% man lookman which should lead you to % lookman cd which should logically make you try % man cdfs which explains about CD writing, damnhmm, the See Also sections says something with 9660 in it (your physical CD contains an ISO9660 filesystem right ?) that you want to srv
% man srv9660 describes how to serve an ISO9660 file system :)
