1>, as suggested by the link to Rob, download and add cocos2d to your current project;
http://www.cocos2d-iphone.org/wiki/doku.php/prog_guide:lesson_1._install_test
, , cocos2d 1.x 2.0.
, iphone 1g 2g, cocos2d 1.x
- , cocos2d 2.0
2 > xcode uikit,
cocos2d exiiting uikit.
3 > , cocos2d,
:)