What do you need to setup a network

What do I need to setup a wired/wireless network

1. Have a modem/Router connect to the ISP for accessing the Internet.

2. Enable DHCP in the router to assign IP to each networking computer.

3. If it is wireless router, it may come with 4 or 8 port for wired. Or you can add another switch connecting the router if you have more computers.

peer to peer workgroup setup

To check or setup your network, open Control Panel>Network. Under Configuration tab, you should have Client for MS Networks, NIC, TCP/IP and perhaps File ...
http://www.howtonetworking.com/workgroupsetup.htm