IPhone App Developer

I am currently working on an idea for an App for the iPhone. I have a background in Graphic Design (no longer working in this field) and have done a couple of courses in iPhone Development and in Objective C, however I have no previous programming experience.
I have run into numerous problems whilst working on the code for the App, (due to my lack of experience) and would therefore benefit from the assistance of an experienced iPhone App developer.
I am looking for someone who can work for no more than £20 per hour and 20 hours per week, starting with just one weeks work and then reviewing to see how far the job has progressed.
I have completed all the screens, for the App, in Storyboard, so it really just needs the coding.
Thank you.