" I'd want to be able to buy a kindle book and read on any of the devices "
Since I own a Kindle I can offer that the Kindle will not do that. Can you share what article you read that made you think the Kindle had such capability?
As to your network, why not get the newer Apple Time Capsule (old review at http://reviews.cnet.com/network-storage/apple-time-capsule-500gb/4505-3382_7-32818588.html ) and you have your shared storage? I won't duplicate web pages or manuals about setup or security.
Maybe with one new thing, you're done.
Bob
I've been using a Mac for a number of years but only the very basic stuff - MS Office and the internet Have a single computer, with a couple of user accounts set up. Never even used iTunes to buy anything yet.
So in response to family pressure (and a new house), I want to set up a wireless home network. I envision having 2 Macbooks, a 2-3 iPads and a couple of iPhones.
So I'm looking for a guide or guidance on how to design a home network from scratch. I would want both computers to access some of the same documents, I'd still want user accounts / security even with a centralized server / hard drive, I'd want to be able to access music, pictures, etc. off of all, I'd want to be able to buy a kindle book and read on any of the devices, etc.
So in other words, how do I become a MAC / iPad / iPhone / Network expert rather than by trial and error.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic