Simple steps for writing programs

http://www.makeuseof.com/tag/develop-simple-iphone-app-submit-itunes/

Step 5: Download XCode
If you don’t already have it, download XCode. According to Apple, “Xcode is a complete, full-featured IDE built around a smooth workflow that integrates the editing of source code, with the build and compile steps, through to a graphical debugging experience – all without leaving the view of your source code.” This is another huge download, so you might want to rent a second movie.

Step 6: Develop Your iPhone App With The Templates In The SDK
Once you have your app drawn out on paper or in Photoshop, you can start designing it with the templates provided in the SDK. This is where that HUGE amount of download time will be a huge benefit. You will have lots of templates to choose from, and there are a lot of great YouTube clip tutorials on how to use the templates effectively.

Step 7: Learn Objective-C For Cocoa
If you love programming languages, you will love Objective-C. If you don’t know how to program, this is the part that can get pretty sticky, so you might want to find a programmer friend or hire someone. It really does help to get a book, too, for reference.

Step 8: Program Your App In Objective-C
Once you at least understand the basics of Objective-C (or at least know how to find answers to programming questions), you are ready to program your app. It helps to take screenshots as you go along so you can remember what you tried. Some apps can take just a few hours to program while other Apps can take months. Only you know how much detail you want out there for its maiden voyage in the App Store!

Step 9: Test The App In The iPhone Simulator
The SDK comes with a lovely iPhone Simulator. You will need to load up your app and do your own testing. You should try to work out as many bugs as possible and think about all the ways someone might use your app.