Need help sharing my evdo broadband connection over wireless

I use a Verizon EVDO card in a pcmcia to pci adaptor in my XP desktop for internet access. I am looking to share this broadband connection thru my Netgear wgt624 router with a couple XPlaptops. I set up an NIC card with a fixed ip then configured the router to use that ip range and the fixed ip of the card as a gateway. I plugged the Cat5 cable from the NIC into the broadband port on the router but can’t seem to get the connection to share. Any ideas on what I am doing wrong?