Welcome,
It doesn't sound like a mistake (on the account creation part). Right now, the website is not the same database as player accounts. Those are going to be merged in the future.
I would close the game altogether and try logging in again.
As for character creation, that can be a bit tricky at first. After you've chosen an origin and archetype, you'll get to the power wheel, with primary on the left and secondary on the right. Once you've chosen from the available power sets, hit "Select" in the middle of the circle. It's almost grayed out looking, very light colored on my screen and hard to see. Once you hit select on your powers, you can move forward. I have found it's easier sticking to the "next" button on the bottom instead of using the tabs at the top. I've crashed a few times trying to use th tabs. Hope this helps