Could someone make sure I'm making a hexed poster model the correct way?

Earlier today, I decided to create a set of WW2 era Posters based off of a template uploaded to the old addon site.

What I’m trying to understand, is a simple explanation on hexing models in a step by step format.

I already have VTFedit installed and I made a rough VTF file.

(This is what the image looks like)

I just don’t know if I’m doing this correctly and what other custom files I have to make for each image.

Resources I’ve looked at: Poster file with confusing directions in the description.)

Test Run files