Re: IPhone Game Development Help!
I've released large scale indie games on iOS and Tegra devices, one using UDK (then transferred to UE3) and another using Unity (then grew into Unity Pro).
As for getting started as an Apple developer, it really is as easy as paying $99. You don't even need the mac immediately, you just need it to publish your finished game to the App Store. Matters become increasingly more complicated as you get closer to releasing your product, as Apple requires a lot of key information such as bank account information. All of that information is on Apple's dev websites though, so just be sure to do your reading.