Not sure what you mean by setting your router to wireless, mine runs both wireless and wired connections at the same time, and most do. But if you have to, set it wireless first and ensure that it has connected to the internet.
Then turn on both new computers and let them do whatever they have to. When finished, and assuming both have built in wireless adaptors, go to the bottom right hand corner where an icon will be flashing orange, click on this icon and it will reveal any networks that it can see. Click on yours and then click the connect button in the same dialogue. Enter the passphrase that should be on the bottom of your router and that should be it. Do the same with both machines and you have your network.
If the router has to be configured first you will have to contact your provider for the access IP address and password. Get back of you need help with this.