Need to create a Separate Wifi Network @ Office

At my small biz, I have AT&T (formerly Bellsouth) High Speed DSL...  Runs into a Motorla DSL Modem for the Internet connection, then to a Cisco PIX for our Firewall.  I can hang an Airport off the network, but our iOS devices can't pull Exchange Email if connected to the wifi.
So I'd like to hang the Airport off the DSL Modem... I first tried with an old Airport Express, wifi network was fine, but couldn't get Internet no matter how I set it up.  The DSL Modem is making the connection, but I'm unsure how I create the Separate Wifi Network with the Airport connected directly to it. 
I'm going to use a Time Capsule A1254 rather than the Airport Express... a little direction would certainly help.
Thanks!  Scott

The Motorola is a Netopia 3347-02-1022 gateway device.  We do authenticate with PPPoE, which is being managed on the 3347.  We have a static IP, the PIX gets the internet from the 3347, our domain controller handles DHCP.
I assume that you are getting a single static Public IP address from your ISP and that is is "applied" to the 3347 gateway's WAN interface ... correct? I am also assuming that the 3347 is handling the NAT service with your DC handling DHCP for the issuance of Private IP addresses on the local network.
The AirPorts are consumer-grade routers and do not offer any VLAN functionality ... other than the Guest network feature of the 802.11n Extremes and Time Capsules. As such, any VLAN-type network "subnetting" would not be possible. At best, you can enable NAT & DHCP in combination to allow the wired/wireless networks behind the AirPort's NAT to have a different Private IP address range. Note: There is no option to disable DHCP separately with the AirPorts. You basically have three options: 1) NAT & DHCP enabled, 2) NAT disabled & DHCP enabled, or 3) Both NAT & DHCP disabled. These options are controlled with the Connection Sharing option on the Internet Connection tab of the AirPort Utility.

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