3) Adjust, rate edit and tag in Aprture. Some get more treatment in Photoshop.
In a nutshell, that's it. As far as storage the great thing about Aperture is that little magnifying glass.
We have a 'mother library' on a Time Capsule in the studio. I can pull up my best shots from whichever Hotel/Church/Resort that the potential bride sitting next to me is having her wedding. It's very helpful in the sales aspect of a business.
As mentioned, import your images to the library & backup said library in 2 different locations. In fact concerning backup, just read
this thread, I learned things about DVD-R's I had know idea about. I never bothered with iPhoto, but I'm sure you're gonna love Aperture. Oh & try to learn the keyboard shortcuts and using presets, they'll definitely expedite your workflow.