Web-server – How to setup Bind9 on ubuntu as a nameserver

I would like to setup my own dns servers ns1.myhostingdomain.com and ns2.myhostingdomain.com
I have two seperate servers to use, one as primary and the other as a slave. My goal is to set it up for a web hosting setup. I would like to be able to add new domains (zones) and then have the newly purchased (hosted) domain point to ns1.myhostingdomain.com and ns2.myhostingdomain.com

I figured I would start with the primary first without the slave added and then once I have the primary working I would try to get the slave working.
I have bind9 installed on ubuntu 9.10 (karmic)
It comes partially configured I guess. So far I have done the following:

Modified: /etc/bind/named.conf.options – Changed forwarders to the name servers that are above my ns1.myhostingdomain.com server (the hostname is not actually ns1, it is poseidon.*, if that matters at all)

options {
    directory "/var/cache/bind";

    // If there is a firewall between you and nameservers you want
    // to talk to, you may need to fix the firewall to allow multiple
    // ports to talk.  See http://www.kb.cert.org/vuls/id/800113

    // If your ISP provided one or more IP addresses for stable
    // nameservers, you probably want to use them as forwarders.
    // Uncomment the following block, and insert the addresses replacing
    // the all-0's placeholder.

    forwarders {
            69.20.95.4;
            65.61.188.4;
    };

    auth-nxdomain no;    # conform to RFC1035
    listen-on-v6 { any; };
};

I added a zone to /etc/bind/named.conf.local

#start_zone myhostingdomain.com
zone "myhostingdomain.com" {
        type master;
        file "/etc/bind/zones/myhostingdomain.com.db";
};

then I created the zone file /etc/bind/zones/myhostingdomain.com.db

;
; BIND data file for local loopback interface
;
$TTL    604800
@       IN      SOA     ns1.myhostingdomain.com. dnsadmin.myhostingdomain.com. (
                        20100809001     ; Serial
                        1H              ; Refresh
                        15M             ; Retry
                        4W              ; Expire
                        1H              ; Negative Cache TTL
                        )
;
@       IN      NS      ns1.myhostingdomain.com.
@       IN      NS      ns2.myhostingdomain.com.
@       IN      A       184.106.207.45
ns1     IN      A       184.106.207.45
ns2     IN      A       184.106.229.136

is there something I am missing or am I doing this completely wrong?