I don't think you need to do any thing on your documents. kindle books are available to read on Upton 6 devices at a time, if bought from Amazon. If you are trying to download your own books, the easiest way is to download 'send to kindle' software from Amazon. Install it on your desktop. Now right click a book and click on send to kindle link in the menu. This book will be transferredto both your kindles for free via wifi provided the account is same for both kindles. This would cost a few cents if done thru 3g.
If your son has a different account, don't worry, just use the same program but register it to his Amazon account.....Hope this helps
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