1) I'd pick up a Java development book and read the chapters on variables, looping, program constructs, if...then, etc. Skip the chapters on UI, JDBC, J2EE, etc.
Then read thru RIM's Developer Guide. They are not great but they do give you a good intro to the device.
Third, look at their sample apps.
Lastly, dig in and build something.
2) I typically make the variable module level and the menu then has visibility of it.
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