They list the constitutional amendment process on the page, a lot of the finer details are decided on afterwards, this has been the case for almost all referendums. It mentions specifically that consultation with aboriginal leaders, parliament and the broader public would help design the voice. It also mentions that it would work alongside existing organisations and structures, again, advisory boards are very common.

They also explicitly state that the voice would be chosen by aboriginal and torres strait islander people based on the wishes of the community. It also says members would be chosen from each of the states, territories and the torres straight islands.

If it's the structure of a referendum that you have a problem with then cool, but it wasn't a good reason to vote no.

Also please read, it talks about all of your questions. It's honestly frustrating to hear you say it doesn't talk about any of it when all of these things are covered in the official literature.