First I'd like to say the starting class selection seems well rounded and reasonable.
However there are some very nonobvious actions.
Create your own everything. There should be a very definitive "build your own class" instead of having to "edit" an existing class. [If this already exits, i sure couldn't find it!]
Next "edit" itself. There is no reason you should use the word here. Why is a user "editing"? There is no justification. A user doesn't want to edit. I would strongly recommend renaming the button to be "Customize class" and make the button like 3-4x bigger.
Now when you're inside of the customization, I see there seems to be like 2 layers of editing. I don't think you should nest the choices that far down. Also once you get to the deepest layer that you can actually modify attribute points you now even need to expand a whole bunch of accordions to manipulate this. Please get rid of these accordions, or atleast expand all by default. Or expand all that have a single point used by default.
Finally completion of customizing your character. Why would i want to go back? "Back" implies I'm going to lose my changes. You need a positive confirmation button that's giant. A giant call to action "OK" "DONE". It would also likely make sense to add a reset button, makes even more sense to embed reset buttons to relevant areas. Such as attributes has a reset button and skills has a reset button. These should be small buttons.