If I may. First get the bones right. Get dedicated 20 amp lines for the outlets to be used for the gear in the room. Have that isolated from all electrical devices such as dimmers etc. Make sure that the HVAC is quiet and will not interfere. I suggest linear diffusers. Your HVAC guy will know what that is. Do you have the dimensions of the completed space including windows doors etc? You can take those and have computer modeling of the room done and have an idea of what will be required for treatment. THis is not expensive particularly if you are working with a dealer to do your project. This will give you a good start. Best of luck
To expand on Elliot’s good advice, Vicoustic offers a 200 euro room analysis service that I found to be valuable.