tips with using xcode on mac os using agentic coding

Hi all,
So, I managed to get my hands on an m1 macbook air. Before the comments come flooding in, yes, I know this is an older product. However, seeing as Mac OS is still supported, and it was the cheapest entry back into the mac ecosystem, I figured this is the best way to get started. So, I'm creating an app for iOS and Mac OS, called blind markdown editor. Future posts will expand on exactly what this app does and how it differentiates itself from the competition, but long story short, I'm pretty useless with programming. therefore, I'm using an agentic coder, particularly claud. I was wondering two things. are there any good tutorials I can use to learn xcode with the latest Mac OS, and I know Claude is going to do most of the programming work, but for those who have dealt with it, what's the best way to make most of the tokens you get, because I used the opus and sonnet model today, the combo option, and within three prompts, I already ran out of tokens. How much different is it using the default model, literally called default in the list, versus sonnet, vs opus, etc. also, how do I run and test apps using my iPhone instead of using iOS simulator, since xcode is already going "not responding" while doing all of this. Any help appreciated.