DNS delegation

[Tim Sandquist <tsandqui@yahoo.com>]

Does anyone know how to set up domain name delegation?

I want to set up a nameserver on the internet that will 
do reverse lookups for a chunk of IP's.  My upstream
ISP has already delegated the IP's to me but do I need
to do anything more than that?  I heard that I need to 
register the in-addr.arpa address.  Who do I register
that with, the registrar I registered my domain name with?

Thanks in advance.

Tim