How should I implement combo attacks, kinda at a loss here and any help would be much appreciated. I’m going for something similar in style to dark souls if that would help any. Thanks in advance for the help 
Dark Souls has combos? 
Can you please be more specific.
Look into input buffers.
After that, you probably want to design a custom cpp blueprint callable function to play montages with extra extra options.
So that you can add stuff to a stack based on keys pressed, and replaced stuff on the stack based on new input when it hasn’t yet been executed.
If you don’t know what a stack is, you may want to look at that too.
Your ask is definitely not an entry level thing to achieve…
Whatever you do, never use notifies.