If you can keep it straight and flat before you sheet it--you can, most likely, get that twist out.

Don't worry about it too much right now. The sheeting will probably fix it, if you can keep it flat whenyou glue the sheeting on.

If you can't get the twist out, after sheeting and covering--then your plane is going to fly just fine.

With the LE of one wing at a higher angle of attack, it will want to lift more on that side. Thats going to cause a roll to the opposite side. Hard to say how much.

You might not even notice it. I've screwed up worse than that before, and didn't even notice it when I flew the plane.