hey tony - you need to start with OpenGL. i would really recommend you to read the red book on open gl - its called the bible for open gl.
regarding general iphone sdk development (objective - c, cocoa touch, etc) i would recommend you to visit http://www.iphonekicks.com - this is a digg clone but purely for iphone sdk links. here you can check out the huge database of community promoted links on different topics (including opengl)
1 last thing - iphonekicks.com also has a tag named "Newbie" where links which are meant for newbie's (not too complex articles) can be found. you can check the same here - http://www.iphonekicks.com/tags/Newbie
