I am trying to recreate the combat system in the game Life is Feudal but make it more complex. The fighting system works by taking in the direction of the mouse movement and if you press the left click it will swing in that direction, though stab, overhead, left (up, down, left right) and right are the only swings that you can do. If you wanted to you could also hold the swing by holding left click so you are able to swing at the perfect moment in the battle. I want to change this so add in more swing directions but I also want to code this from scratch in Unreal. Can anyone give me any pointers or maybe a few snippets of code that work in Unreal that could help me start to implement this type of system?

System like this most likely takes into account mouse movement velocity, distance & direction. There is not much t it, really, and Life is Feudal has quite stiff feeling to it, I much preferred how it worked in Mount & Blade. Get some model that has animations that you're interested in and prototype some system, it's not really that hard if you know what you want to achieve. 

With more directions comes problems like how to actually indicate it with a mouse stroke? You'd have to add something more, like tilting character left or right using some keys (Q/E?) and taking this into account when calculating swing direction and so on. But first and foremost you must come here with some specific problem, because system like this is unique enough that there most likely are no materials that we can point you to, and nobody will write a snippets of code for you either (because what you described is too generic).