AD Rep help needed

Hi all,
I am trying to improve the network
I have 1 main server
which has
ad
users data
antivirus server
ghost
print
dhcp
dns
wus
I am building another 2 servers
i intend to have server2
as secondary ad
secondary dns
secondary dhcp

server 3
antivirus ghost wus

any advice would be much appreciated
are there any simply guides on building a secondary server

server 1 is 2003
server 2 2008
server 3 2008