hi, here are some sites https://coins.ha.com/ref/beginners-price-guide.zx
https://coins.thefuntimesguide.com/value-of-old-coins/
http://coinsite.com/us-coin-values/

this one have pointers you can use as well

http://www.wikihow.com/Find-The-Value-Of-Old-Coins

hope these links will help you. :)