Welcome and your problem mentioned is not a problem at AlI its an grand adventure. The questions your asking are very elemental ones and I have a few suggestions but only if you want take offense. I am talking bout me and maybe my own experience will help you.
I been at it only 2 years but I have been at it hard and for a guy who only buys error variety cents I'm in 5 figures with not a clue what these coins would really bring. No problem there as I am emotionally attached to the coins themselves and am truly an amature collector. What I did was pay full book for average coins my first 6 months. I learned hard the hard knocks way hard and fast and after getting a questional bulk buy learned in the process I have got to know my quarry. Thence I studied and studied more. At present I am a shrewd buyer beware of the likes of me. I will offer you what I am willing to pay for coin X and if we can't deal then its deal Y for me from another dealer. Here's what I know and it ain't much.
1. Sort separate your collection in subplots cents, nickels, dimes, etc. Then do an at home inventory with a 2018 Mega
Red Book.you will be able to call a very rough retail value of each lot of coins. Don't use it as true value because at auction same or better coins go at 35-60% book. Find, seek a certified reputable dealer who will do an appraisal for a well real world value of what you have. There really are many more walking good guys than bad and I would bet near you is a guy who does appraisals for a living and his reputation rides on his conduct. I know 3 near Salem who I have no doubt of their absolute impecabale fair knowledge.I built my opinion on them because I spent good money and learned all about them. You gotta get a professional buddy. If your collection is as substantial as you mentioned then take Er real easy. Learn your matieral.
2. Unless you are wanting to sell fast the amount of effort you put into learning your collection could be the difference of many a restless night wondering if your decision cost several thousand in potential cash price. Your collection needs sorted and you gotta roll your sleeves and get to it. And remember what the old timers said " if you got a coin collection someone will try and steel it ". Put the silver and all in a bank lock box or buy an 500lb safe and lock it at home. A 500 ponder costs about $900.
Good luck Sir and happy sorting I hope you find some good ones and realize top dollar if you sell at auction.