Garage to recording studio conversion-Acoustics Forum-Acoustic Fields Forum

HI all. I live in the UK in detached house with an integrated garage which I intend to turn into my recording studio . All the walls in the garage are brickwork and the floor is finished concrete. There is a full width metal up and over door to the front of the garage.

I am planning on making the existing single skin wall to the external side of the house into a double skin, and also building a double skin wall behind the garage door (so it still looks like a garage from the outside), and I am going to add plasterboards to the ceiling joists, with insulation packed between the joists. I am not planning on floating a room within this space, as it is cost prohibitive, but I am planning on putting a wooden floor down, which I will place rugs on around the mixing desk area/sweet spot to dampen reflections down. I am planning on installing a range of acoustic treatment (bass traps, tiles etc) once the basic internal construction is complete

I would like to know the following:

What type of plasterboard and insulation should I get for the ceiling to best contain the sound? (There will be a bedroom above)
Should I stud the wall and plasterboard it out for best sound containment? (this will also allow easier installation of the electrical power supply where needed around the room)
Or am I best off leaving the brickwork exposed and working on further acoustically treating the room instead?

All or any advice on this would be greatly appreciated. I need to get it right first time. Thanks for reading.