Grading coins is not what most people think it is.
In short, the initial fee will be $200.00 and you will have a coin worth around face value to show.
Whenever you think you have a doubled die, go to verietyvista.com and find a match. If it is not there then you have
Machine Doubling or some sort of other non-collectable doubling (very common).
Most odd looking coins are just post mint damage. A lot of people are mislead by online clickbait videos and tons of worthless
ebay auctions wrongly being sold as rare error coins. If you want to find real error coins, you have to first know what real error coins are.
Looking for random anomalies on coins and hoping they match up to something collectable will take you a lot more time, wasted effort, and disappointment repeatedly finding out you have nothing but post mint damage, useless
Machine Doubling,
Die Deterioration, or minor insignificant imperfections (etc.).
Spend some initial time at places like error-ref.com, doubleddie.com, varietyvista.com, conecaonline.org, coppercoins.com etc. to find what actual and collectable coin errors look like.
A good way to start is, for instance, separate a bunch of pennies by date. Go to varietyvista.com and, date by date, use the reference there to see what errors are known for that specific coin/mint mark. Look for those specific errors/varieties using the pictures provided. After doing this for awhile you will KNOW what an actual error looks like and not have to waste time on face value and damaged coins. :)