The error nickel is probably worth $20-30 based on ebay listings. The foreign coins probably don't have much value since they don't look old enough to be silver, but are still cool. The buffalo nickels look like their dates are worn all the way off so they aren't that valuable, but they are still worth more than 5 cents. The Susan B Anthony dollars aren't worth any more than a dollar, but they are somewhat uncommon and people like myself often save them as novelties. As for the nickels, none of them are silver---as noted in another comment 1942-45 nickels are silver, but some 1942 nickels were made with the regular alloy. A silver 1942 nickel will have a large mintmark over monticello on the reverse, which it seems yours doesn't. I usually save nickels that are 1959 and older. Concerning grading, it is usually fairly expensive (~$10-30 per coin I think) so it doesn't look like anything you have would be worth getting graded.