Organise a simple Word document

I don't need anything fancy, it is for a science school project so I need something classic but I need the document the be well-organised and titles, images and the overall document to look good.

There is a lot of text which needs absolutely no changes, pictures (math functions) don't need anything either so really it's just a small task, to make sure the font is the same everywhere and also if you can make something pretty with the layout but nothing extraordinary!

Find below an extract of the document, you can see it looks really plain, I would like it to look a little 'cooler' but I don't want fancy fonts everywhere or colors everywhere (I mean I don't want you to spend 2 hours trying to do something extraordinary, I'll be happy with a pretty simple layout!)

If you understand what I want then please apply, feel free to ask questions!

N.B: There is no need for you to speak French to apply, as long as you don't remove any text from the document.