Canadian Dollar Face Value?

I have a good chunk of Canadian dollars (around 15). All ranging from the late 60′s to the early to mid 80′s. 4 questions here. Answer whichever ones you can! Thanks!
What would you say the average value of those are?
How can you tell if they are silver proofs, not nickel proofs?
Where can I go trade these in?
Will these coins go up in face value by the year, or is it around the same price?

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