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By "set" he means a number of eyepieces of different focal lengths - normally the same "make" and "model" - eg. Televue plossl eyepieces.
Eyepieces are used one at a time - they don't screw into each other. There are those who prefer to have the eyepiece at the correct focal length they want, rather than using a different focal length with a barlow lens.
You've correctly understood that, with higher magnification comes lower brightness of the image reaching your eye. But remember, high magnifications are often defeated by the "seeing" conditions - the image is yuck!
deeneil, you need to sit down with someone and look at and discuss eyepieces, then spend time at your telescope with some borrowed eyepieces. Best place for this is a starcamp. Why don't you try to get to one of the camps coming up? Alternatively, put out a request and I'm sure someone would be happy for you to visit with your scope, or maybe visit you.
Also go back over eyepiece discussion threads on this site - you will find a lot of information there.
Cheers
Eric
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