New Collector After Seeing Youtube Videos. Need Info On My Collection.

Hi. Thanks for welcoming me.
I was watching youtube videos about coins and collector bank notes.
So I started my own collection after getting some silver certificate bank notes as change from my local bank branch. Then also getting a silver Benjamin half dollar coin as well.
So now just a few months later, I've grown my collection with some steel pennies, Mercury and Barber silver dimes, some Morgan silver dollars, and more. I have plans to buy more silver and eventually some original gold coins as well.
Also, I have been looking very closely at every bank note and coin that passes through my hands for any signs of value including mint errors.
I now have a separate collection of bank notes and coins wuth US Mint errors, as well as unique serial numbers and star notes, since alot of youtube videos talking about people wanting them, but I wouldnt know how or where to sell them.
The precious metal coins, I plan to accumilate and save to give for my toddler when he gets older.
I hope with all the info I provided, somebody may be able to point me in the right direction.
Thank you.