Hi,
It's impossible to estimate based on what you described about your project, any developer will need more detail like: application functionalities, iOS version compatible ( 6.x, 7.x or 8.x). I also need to see how you organize your APIs backend output, if they're all standardized that would be great.
As you see my profile is quite clean, without any experience, but I do have 4 years developing iOS apps, I've just started being freelancer doesn't mean I'm not good enough. Contact me, I'm gonna prove what I said totally true