A) You can go to any coin dealers with your coin and for some dollars, he will evaluate your coin. If he is honnest and if you can trust him, you will get an accurate value of it. But sadly they know what your coin worth and if he want to buy it from you, you'll get a lower value so he can buy it at a low price for selling it afterward at its real value. Its normal he's making a living out of coin dealing and he's there to make profit.

B) Buy a good book about details and varieties of Canadian coins. Just like this web site that I have developped, I've created a book called "THE BOOK OF CANADIAN COINS AND THEIR VARIETIES" which will easily help you, with pictures, how to grade and evaluate your coins just like professionnals do.