You should be able to leave you computers hardwired as is. Quite often the wireless hubs have rj45 connections.
You'll need to check if your printer supports Macs.
Not all multi-functions work with Macs. Well more than print that is. Quite often the scan and fax functions do not work with Macs.
Then check out Wireless Print Servers.
You will need to check
A) they match your network speed. ("n")
and
B) they support multi-function printers.
If you decide you do not want to incur the costs of the print server you can continue to leave your printers hardwired to your computer and share them on the network.
I hope this is a good start for you.
