"The other problem I have during the network set up operation is I am unable to include the wireless router as it has no USB port for the flash drive."
Huh??!! Why do you want to plug a flash drive into a router?
Have you manually enabled and configured File and Printer Sharing? have you installed the network printer on the other clients? Have you used an appropriate workgroup name and typed it using the SAME case each time? Have you configured your clients' firewalls?