If you want to build iOS apps, the best way to get started is to install Xcode. Here is a little tutorial showing how to do that.
The best way is to get it from the App Store. It will take a while to download since it’s a huge application.
Once it’s installed, open Xcode, install components and you are done. If you are a registered developer, you can install it from the apple developer portal.
Please click on downloads
If a beta is available it will appear on the top. If not, scroll to the bottom, you can download Xcode their through your browser.
Let me know if you have any comments, questions or concerns.