As soon as we approve your app it will be available on the App Store. From here you can take any steps you like to promote your developer profile or Apps, we suggest using social media such as Facebook and Twitter to target your audience and make them aware of the Apps you have created.
If your App picks up enough pace, it may become a featured app, and as your apps get better reviews they will rise up the App Store towards the front page and featured apps. This is great as it means you will have more weight behind you as a developer to create new Apps that reach more customers and could generate more profit for you.