Leaflet And Poster Research

I started looking at leaflets and the way they are laid out. For example the different folds you can get as seen in the image below...

This image helped me a lot in terms of deciding what sort of leaflet i was going to make. There are both traditional folds and more modern folds in which i can choose between. However i want to use the trifold leaflet as its traditional, simple and effective. 

Poster locations: 

Brighton and/or London bus stops...

Tube stations and other train stations...

Other poster hot spots, escalators, shop windows, walls or railings...

These poster locations can be found in both Brighton and London, so the print sizes in which i will need to be able to print my posters at would range from A4 all the way through to A1. To do so i will use a vector image editor for example Adobe Illustrator.