In order to get your app into App Store, you will need to create an application (in App IDs) with the same Bundle Identifier as you presently use in your application..
Also, you will need valid provisioning profile set up for use on the App Store. You'll find this in Provisioning Portal under Members Center. Don't forget to create this profile in the Distribution tab and choose the appropriate App ID (the new one you have created).
Then, you will need to download that provisioning profile, drag it into your XCode to install it and use it in Code Signing part under Build Settings.
At last, you will need to visit iTunes Connect, where you'd create a new application request (under Manager Your Applications). Be sure to use the same App ID that you use in your application.
After this, archive your application in XCode (using Project - Archive menu item). Make sure your current scheme (top left dropdown) is set for production use, not debug. You can edit your schemes to verify (not sure under which menu it is now).
Last step is to click the archived application and select Distribute (or Share in older XCode) and choose to export into App Store.
I hope this helps you a bit :)