For saving notes, you could make a data container class that inherits from NSObject and conforms to the NSCoding protocol. Then you could wrap the note object in a NSData object and save that to NSUserDefaults.
For sending an email, look at
MFMailComposeViewController.
To create the view that creates the notes, just have a textview and then when the user clicks save, get the text from the textview and save it into a note object.
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