How to setup a Wired and Wireless home network

[wana1]

I have an iMac and a e-Mac connected by a switch which is connected to a DSL modem to access the Internet, they must be communicated to each other in a wired network to run in "multi-user" mode the "Account Edge-MYOB" application installed in both computers because it doesn't work well in a wireless network.. Now I also have two MacBook requiring wireless access to the internet and two USB connected printers that need to be shared by all four computers. I need to know which is the best way to setup my small network using my DSL Modem, a Switch and an Airport Extreme.
Thanks

 

[Verschoren]

Connected your Airport Extreme to the modem via ethernet

Connect both computers via ethernet to the Airport Extreme
Configure the wireless network with the Airport Configuration Assistant
Setup the created network on the MacBooks

For printing:
Connect the printers to one or more wired computers, and turn on printer sharing. At them on all the other computers.

Or, but not sure if it works:
Buy a USB-hub with 2 or more ports
connect both printers to the hub and the hub to the Airport Extreme
configure printer sharing in the Airport Extreme

finished ;-)