How I structure my ideas is firstly by keeping notes in any way on my reach to put down ideas. In paper, on the phone, in voice notes and written bits and pieces. Early morning, middle of the night, and during the day.
Then I expand these notes to include the details that kept coming to me with or without my authorisation. The filling of these ideas assault me in dreams, in the shower, when I go to the toiled during my working day. But they come more when I am walking.
Next I start writing what needs to be put down, the parts that if I don’t make real will keep annoying me incessantly, these are the texts that won’t go away, that will fill my thoughts and ideas until they are resting in a physical form.
Following I have to organise where it all goes and write the other bits, the ones I had only the sketches for before.
Depending on the project it doesn’t have a pre-created structure. The book I have written in Portuguese, Simplesmente Gerva, has been created in a series of emails between my co-author and myself, and we never knew what the other was going to write.
I am now writing the continuation of this book and, although I am writing on my own, I am being faithful to the proposal. I don’t know much of what is going to happen to the character, I sit down to write and let him take me wherever he wants.
Sometimes a whole idea is born from one thought, one example is the one I mentioned in another post: what would a writer do if they didn’t have the means to write and which situation would that be.
To surmise, I impose no rules to myself. Whatever works, works.