What effect will new iMac have on existing WiFi network

I will shortly be going from my 2008 iMac to a new 2013 one. I intend to set up the new machine via either Migration Assistant or TM. I have my current iMac connected to an Airport Express (ethernet to cable Internet), and I have 2 iPhones, an iPad, Apple TV, a Yamaha AV receiver and my printer wirelessly on the same network. I use the iPad extensively to control the entire system when I am too lazy to get up from the couch.

Will I have to start from scratch with my network - setting up a new network and individually finding it and supplying a password with each of my peripherals, or will it all work the same as now simply by setting up the new iMac identically to the old?

Thanks,

Steven

 

Thanks

I think a surmised that. The network goes from my Airport Express outwards. I thought it might start with the computer, in which case I would have to change everything. Thanks for your help.