Notes with circle and a straight line under are half notes (2 beats). Notes with just a straight line are quarter notes (1 beat). Notes with a straight vertical line and a short horizontal line are eighth notes (half a beat). I think that is pretty standard 'tab' notation. There are others like triplets, 16th notes, etc. Hope that helps. Listen to Django's recording to get the 'feel' since that can't really be notated (and to check my transcription for mistakes...)
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Could you explain your legend on a napkin please? For example, why the circled notes? Sorry if this is common knowledge...
-Noob.