Walls for a future Studio

[Herman Heil]

Hi to all,
Im completely new in this field so please forgive me if my question is too vague or has been answered before.
Im about to start buillding a medium to large home studio and Im completely lost as to how soundproof the walls.
I will hire people to do it, but I would like to have a general idea so I can check what they are doing.
Are double walls with fiberglass inside effective ? Should I have the walls separated one from the other ? wich way ? Which kind of fiberglass should I use, rigid or fluffy ?

Could someone post a drawing or a picture of the walls as you were building ?

a note: I bought the book "Home Recording Studio Build It like the Pros" but Im afraid it is too technical for me ...


thank you.
Herman