Once you've bought an app, you cannot return it, as with non-internet stores. You must stick with the app you've bought.
Publishing your IPhone or IPad app on ITunes store is a multi-step process. You have two different choices. 1. Hire an expert like DotQ Solutions, LLC, or there are many others. 2. Do it yourself....
To sell apps on Apples App store you need to enroll on their developer program and then submit your app to Apple for approval. (See links below)
If you want a new game then get Buster's Flight. It's really fun, I recommend it! I would say angry birds or cut the rope or Funny Duck
Download installous on iPhone (In the IPhone Store)