You are not allowed to use super dealloc in ARC. So if that compiles, you are not using ARC and you need cals to retain and release . Writing a whole tutorial on that is not something that will fit in a stack overflow answer.
As for your other questions.
As borrden mentioned, retain/release and objective-c memory management is a considerably large topic, one that has been extensively dealt with. I'd recommend reading this to get started and do some more research from there.
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