Need info for adding wireless to wired setup

How do I add wireless to my wired setup? There is an imac, macbook Pro, and an HP laptop on a wired router. I expect to add ipod touch to the group. I don't know anything about wireless so I don't know what I need to know!
Any info would be welcome.

Please be sure to check back if you do have any questions, especially before purchasing anything. Ken also offered another option and that would be to turn one of your Macs into a "software" router.
OS X has a built-in Internet sharing feature. Without having to buy any additional networking equipment, the Mac that has both Ethernet and AirPort capability could be used as a router. It is not full featured and it does not offer very good wireless security, but it may just be what you need in the mean time.
However, in the long run, I would recommend that you just get a WAP or an AirPort Express to provide the wireless network.
An example of a non-Apple WAP would be the Linkys/Cisco WAP610N.

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