Case 3) Starting from scratch
If you don't have an existing network, and wireless clients are a part of your plan, then build your network around a wireless router. Wireless routers will share your Internet connection, provide basic firewall protection, and allow you to build your network with both Ethernet (wired) and wireless clients. Figure 3 shows you how to get hooked up using this method.
Figure 3 - Network using a Wireless Router
Tip: If you're using a software Internet sharing method, you might consider trading up to using a wireless router. You won't have the hassle of having to have another computer up and running in order to access the Internet, and you may find that your shared connection is zippier with a router.