Pregens are never a bad choice. I have most of the books so I'm building my own. If you don't have the books you can pretty much build a human with any class as I understand it. The new races replace all the elves and dwarves and such. Neo just adds to the feats and spells and such so anything normally allowed in pathfinder as far as feats and spells is pretty much fair game. Though you will want to download the free guide to organized play if you build your own character, similar to the guide to society, and he's got a link to it on the event page for the game under the con's event page.