Just a month back I picked up a newer imac so had to do just as you want to do now from my other imac.
Migration Assistant is a built in app that moved all my stuff across over an ethernet cable.
This was recommended as a quicker means than wifi.
The whole process took about 2 hrs or so and was no sweat at all. I initially googled how to do it "cos I ain't no "tech head" really.