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Live Sound: Starting with Room Demensions MATH/Software

Did a search and did not find this so here goes.
Instead of starting with equipment, would like to start with a room and do the math or use software to determine how much wattage to put in it to obtain a certain dB.

Anyone know where to start to get there?
Room is approx 100x60x20.
Standard sheetrock walls.
Carpeted Floors

Thanks,
TNT

so i am doing live sound and..

so i am doing live sound and I'm about to mic a marshall half stack(fancy tan/brown tweed mesh) with a 57 in the top right speaker and the guitarist tells me it sounds better if you mic the bottom speaker because of the design/acoustics on the cab.

I didnt question him and just miked it on the bottom right.

Is there any truth to this?