If you have a standalone campaign with a dependency on Origins, you'll need to modify the character creation scripts quite a bit to get them to work correctly. I would not take that approach if you can avoid it. Either create an add-on, or a standalone campaign without the Origins dependency, and use the character creation template in the wiki article I linked with the modifications described in the necessary scripting section.
I have some tutorials on character creation in the
Implementing a Basic Quest series. You may want to take a look at that if you haven't already.
