Restricting "Outside" lookups

[FSD]

Hello All;
      I think what I need to do should be pretty simple. I want to setup
a nameserver that forwards all my internal queries to my main nameserver
ns.mycompany.com that will answer for mycompany.com. But I do not want 
any of my computers to query the outside world. That is, all computers
can query the company addresses not nothing else. How do I do this?
Thanks a million
FSD