Look at the chords or Identify the scale. What song or chord progression is it? I may be able to help.
I'm assuming you're reading regular staff music, not tabs, and if you are, you know what notes you're playing. Look at the beginning note and the ending note, and based on that, look for IVs and Vs in that major or minor scale. Also: sharp VIIs usually indicate a minor key as they are often raised to give them a leading tone quality. Music Theory Jargon!
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we get this question generally several times daily. theres a sticky at the top of the MT forum. read it and if you aren't getting something specific please feel free to ask a question about what you specifically don't understand. im going to ask that this thread get closed now and feel free to post about what you don't specifically understand.