I have been looking at samples leaflets to give me an idea of the content/ layout as well as format and how they were folded.

It holds a lot of information and is really busy. However, the unfolding is logical but there is still "breathing space" to between each listing. The listing itself on the inside pages has been colour coded. It makes it visually easier to follow; the reader knows exactly where one section starts and finished. The size of the type is quite big.
I have also found this website with interesting layouts: naldzgraphics.net