I have been given some sheet music that I need to play. The Problem is I don't understand when to come in.
What do the big numbers mean above the bars (2,11,11,14)?

Sorry its upside down 
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The "bars" are measures of rest. 2 measures at the beginning, followed by 11, then 11, etc. The grouping probably has something to do with how the composer interpreted sections or important parts of the song.