You will have to experiment and try things out for yourself and you will not be sure of what you are doing. That's all right, you are feeling your way into the thing.
“I don't write down my experiences, but I have a very decent memory. I have tons of books in which I write down phrases as they occur to me. That's how I write songs. I'll need a line and I'll go through the books and find it, the right rhyme and everything.”