To upload the App to the App Store you need :
- Be sure you don't break Apple rules.
- Build your app without any error
- Archive it with the "Distribution" profiling
When archived, it will open automatically the Organizer.
Choose "Validate" and wait Apple confirm it.
If all is ok, you can distribute it with "Distribute" button.
After those things, wait at least 1 week they review it, and pray!
Remember if your App is less than 20Mb, users can download it from the 3G too.
Else, they need to download your app using wi-fi.
Long life to Steve!