There are a number of things that you have to do to make this work.
First the wireless network. You are setting up a peer to-peer network, not an infrastructure network. You have to set both cards to peer-to-peer in their setup software and set them to the same wireless channel.
You also have to set both computers on the same workgroup. Right-click on My Computer and open the Computer Name tag. Each computer should have a different Full computer name, but should have the same Workgroup name. Change one or both as appropriate. Finally you must have a drive or folder set to be shared on each computer. Open My Computer abd right-click on a drive. Click on Sharing and Security and set up a shared drive. Alternatively, open a drive and share a directory as above. You should now see the shards in My Network Places on both computers.
To share the internet, it is easiest to run the Microsoft internet sharing wizard, as this does a lot of the work for you. Go to My Network Places and run the Network Setup Wizard. Follow the instructions.