Separate circulation coins and sets. Sort your circulation coins be jurisdiction (if applicable IE Canada, US, Newfoundland whatever), denomination and year. Then take a look at the grading guide info at
http://coinsandcanada.com/coins-grading.php. Once you have a rough idea of how to tell a low grade from a high grade work through the price list at
http://coinsandcanada.com/coins-prices.php to identify if anything you have is potentially valuable. Sometimes a specific variety is more valuable (IE a 1974 nickel dollar double yoke) which is where the USB microscope can come in. If you find one you want to ask about on this site then run both sides through a scanner on the highest resolution setting and use the microscope to take closeups of any relevant specific points on the coin. IE the area of the variety if applicable and/or closeups of the high points for grading.
The sets are unlikely to be particularly valuable with one or two exceptions. Check them against Charlton Vol 2 and, if there is a valuable variety then dig out your microscope or magnet as applicable to find out if you have it. Also keep an eye out for die rotations
http://coinsandcanada.com/coins-err...d-die&id=24); can be particularly valuable in sets but not so much in circulated coins unless significantly rotated (like 45 degrees+).
If you're really keen take a look at
http://coinsandcanada.com/coins-err...rieties.php. Most of these won't add much to value but can be interesting.