Option Millionaires

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I am trying to learn CS and PS. Could you explain how you leg in and out. Looking at SLV Jan 24 19.5/20 CS @ .29x30/.12x.13. If the 19.5 is purchased at .30 and SLV rises by $1 and then the 20 is sold at .59 then there is a credit. If held until they expire then the long position expires worthless and the short position keeps its premium? If the long position is sold first then the short position is naked? If SLV continued to rise for the next 10 days is there a risk that the person that bought the calls sold short will exercise? At what point do you exit? Thanks