I am very new to linux and need some help on iptables

I have a remote virtual privat server running fedora core 4, with root access

I want to know if I can configure iptables to do the following:

my-ip:my-port ---> iptables ->
my-ip:my-port <--- iptables <-

Please not just a YES or NO

If someone could show me how, I would be very happy