Not sure how much help this will be to you, but I just received my packet and SIM card from Sprint, here is a picture of one of the pages about an APN:
If this picture is too difficult to see here are the settings:
Name: Sprint-gprs
Homepage: Enter the URL you want for your home page
Type: HTTP Gateway IP1: 000.000.000.000
Domain 1: Blank
GPRS APN: cinet.spcs
Username and password fields: Blank