Please read through the stickies on top of this forum for gathering iOS experience.. I want to say right of the bat, it's gonna take months, so don't think you can finish your app decently in just 2/3 weeks..
Learning both basic coding and iPhone development together, at the same time, can be a nightmare. Learn coding first, any simple educational programming environment will do, until you feel comfortable writing programs that can actually do stuff and get them working. Then learning iOS development (Objective C and Cocoa Touch) will go at least two to maybe ten times faster.