I want to write my own FATE Core adventures and rules. Where can I find either a font or individual graphical elements for: Overcome, Create an Advantage, Attack, and Defend.
Do these exist? Do I need to scan it from something?
You can download the official Fate Core font from Evil Hat's licensing page, as well as the "Powered by Fate" logo.
This font contains a small number of glyphs, supporting Fudge Dice faces (0, +, -), the Four Actions (A, D, C, O), and some stress track boxes.
They ask that you credit them in the works where you use it.
Side note: Since you're looking to publish Fate products, you should be aware that "FATE" is no longer an acronym and technically should not be written in all-caps.