You should know what you are doing. If you are not fully confident, you should take professional help like GeorgeO suggested. But remember, professional accoustics treatment doesn't come cheap.
So before that, read ... read ... read all you can. All the best.
There is a ton of material on hfv including some build threads, discussions on health effects of materials, measuring software, DRC and such like. and else where on the net too.
Warning: you are approaching the very edge of a precipice. At the bottom of that long steep and unforgiving slope lies good audio. money is not a good enough sled making medium because it can burn off too easily