Some Basic Questions

[#1]

Hello,

I'm new to Qlikview

I'll develop an application and I have some doubts.

Already I apologize for my poor english.

My questions are these:

1) How to create a report with Fields previously selected? For example, a report that always return information of the current month, to be generated.

2) Using an action, or trigger to select values ​​in a field?

3) How to hide a line graph when the value of an expression is null or 0?

Thanks