I have to write up notes on a math course and would absolutely love to make my notes look very similar to this:

Using libreoffice, with texmaths, does anyone know settings, i.e. text format, page layout etc... etc... I should use? (I'm pretty sure this is a program-independent question, but just in case)
I have no idea how to deal with this stuff, when I use libreoffice it starts in the top left-hand corner and covers the page, that's all I know how to do, any help would be greatly appreciated, thanks!
(I fear only a math person would be able to answer this, hence why it's posted here)