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Omard,
The most important consideration is room construction. Audio performance in the theater depends on how the room is built. Not only do you want, I assume, to keep sounds from getting out of the room, you want to prevent outside sounds from getting into the room (that lowers the noise floor). So start learning about things like 'room within a room', staggered framing, absorptive sub-flooring, double layer drywalling, acoustic sealant. Then think about room dimensions that will give better acoustic performance.
Bottom line, since you have some time, do lots of research here and on avsform's theater construction. There is alot of information out there.
Good luck!
Tim
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