I am looking for a resource to tell me the value of this coin.  It is in fair condition.  I have read in several articles that mint flaws can make this coin very valuable.  How do I get it evaluated?

Unless you wish to do your own research, I would bring it to the closest ANA dealer (once the coronavirus shutdowns and restrictions are over that is)

A picture would be very helpful, you can look online for known 1966 Kennedy mint errors.   You can also bring it to the attention of members of your local coin club or local coin/bullion dealer. 

Here's one minor DDO on a 66
https://www.pcgs.com/auctionprices/item/1966-50c-sms-doubled-die-obverse/411640/-6982165587480329474

Hello. Please include some photos; it's difficult to assist without images, as there could be one of a hundred issues going on; could be an error, a die variety or PMD (post Mint damage.) We love to help others figure out things like this about their coins, but please help us, in order best help you. -Sam Gelberd, ANA Numismatic Educator

If you give me the coin and the year i will look it up in the cherrypickers book which Sam is one of the editors. Also tell me whats wrong with it no guanentees. Its hard with a picture i will give it a shot with out. You should take it ti a deaker.