Process in developing iPhone apps

Hi,
I have a little programming experience with PHP, ActionScript 3.0, JavaScript and I was wondering how hard would it be to learn Obejective C, I believe this is the language to use to developing apps for the iPhone if I’m not mistaking.
1- Can someone help me understand the process in developing iPhone apps?
2- Is Objective C the programming language used by Apple to develop iPhone and MacOsX apps?
3- What’s Xcode? Is it a different language?
4- What’s COCOA?
5- Is it the same process for develop iPhone apps as for MacOsX apps?
6- Where can I start learning more?
Sorry! I’m a complete newbie.
Thanks,

1) See here
2) Yes
3) See here
4) See here
5) Similar. See above links
6) http://developer.apple.com

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