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Fine tuning a room for accoustics is a complicated thing. Just throwing around bass traps and isolating material could just worsen your sound quality if you don't know what you're doing(and make you lose alot of time and money). So before you do anything, make sure you have at least a basic idea of how your room works accoustically - where your frequencies build up, how the angles of the walls reflect sound, etc. I suggest trying different listening positions as well as different speaker placements to see which ones work best. Sometimes what seems like a good placement on paper may sound different when applied.
Rules of thumb;
-Avoid having a bunch of corners - curves and angles on the walls and ceillings are a good thing
-foamy materials (egg cartons, commercial foam, curtains, etc) absorb mid to high frequencies only
-bass builds up in corners (this is where you'll generally put bass traps)
-don't go excessive with sound absorbtion, it makes the room sound completely dead and very unpleasant (this also means you probably shouldn't carpet your floor). Positioning of speakers and listening positions is most important.
-make sure the room is symetrical. Don't put your work desk in a corner, and if you put something on one side, try to put something similar on the other - this way the frequencies coming out of your speakers will bounce in a similar fashion on both sides, giving you a more accurate impression of the stereo image.
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