You start by designing your house and for that you need to appoint an architect.
Its the difference between assembling a kit of parts and designing the thing to be assembled your architect listens to your requirements and designs the design of house that you require.
Your architect can also advise you on the serveral different forms of construction and their relative performance in terms of fire safety, sound absorption, resistance to moisture and suitability for future extension.
Finally your archtiect can inform you about how best to procure the building, from initial sketch to contract and final certification, from the appointment of other, necessary professionals to health and safety compliance to achieving passive haus standards or other energy efficient construction methodologies.
"Fail to prepare, prepare to fail."
ONQ.
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All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.