I used to keep my pages about 700 pixels wide to support lower resolutions such as 800x600. Most people today use 1024x768 or higher, but you should code to the lowest common denominator.
As for answers to your questions:
1. If you are talking about margins in Word, there is no easy way of converting to Web pages, unless you use Word as your HTML editor. I would recommend, however, to choose another editor as Word is better at word processing than as an HTML editor.
2. There is no easy way to convert pixels to inches. A 19" monitor and a 15" monitor can both have a resolution of 800x600 which is the same number of pixels both horizontally and vertically.
3. I agree with using CSS for a 3 column layout. I use the same method on my blog. I found it to have more of a learning curve than using tables, but it was simpler to manage once it worked.
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