1. Once, all basic information about the application has been added then you're ready to send your app build for review (please note that build's will take time to be processed). Click on "Prepare for Submission" then "Add Build" and click on "Submit for Review".
2. For iTunes questions, you can respond as in the following example.
3. For Advertising Identifier
Once you're done click on "Submit". Once your app has been approved you will be notified by email directly from Apple that your app is available on iTunes.