Mixing hardwire and wireless with airport

Orcabait

Registered
I have a MacBook running wirelessly from a 3 year old Airport wired to a DSL modem. I want to add a desktop PC hardwired to the internet. Do I run an ethernet from the Airport (the input with the little circle of dots icon?) WHat do I need to configure so I can run the PC hardwired and the MacBook wirelessly. Sharing the printer would be nice too.
 
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