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To answer you second question first, google ”NGC Dealers” and enter your address, it will give you
the closet dealer to where you live.
Hoghead covered it pretty good. It will cost around $60.00 to have a coin graded so unless you have a high grade
(which I doubt you have if they are in a jar) or a rare error or variety, it would certainly not be worth the cost to grade.
Suggest if there is anything you think is worth grading, post a clear photo of both sides on this site, each coin on it’s own thread and there will be someone hear that can tell you if it is worth grading or to save your money.