TCP Wrapper Documentation

I have a gentoo desktop profile system and I would like to use tcp wrappers
to secure certain services like ssh. I followed the documentation I could
find from the security guide to install the ebuild but I don't have the
/etc/hosts.allow or hosts.deny. Do I have to manually create these? Is their
any other documentation available that I can use to help me install and
configure it properly?

Thanks for your help.