Suggestion: Keep the top 15-25 on your list and just sell those on Amazon. (No one cares if you don't have a seller rating if you have the lowest price.) Donate the rest to your local library book sale. After Amazon fees and your time you'll make pennies. Barely.
Enter them all with a boilerplate description "This book ships fast from Minnesota, etc." UNLESS the book has highlights or marks, which should be mentioned in the description field under the quality designation "ACCEPTABLE."
Start collecting shipping material (envelopes or brown paper bags and shipping tape) now so you have it on hand when something sells.
Bookmark or print out the
Media Mail rate schedule and keep it on hand, as that will be the basis for your postage costs. I use Amazon.com shipping services to have the verification and to save time, but most beginning sellers will just use stamps. (You can't print out Media Mail rate stamps on the main USPS site, at least as far as I have found.) The Amazon.com shipping services cost a few pennies per transaction. I don't mind, but depending on your Mustachianism level you may want to avoid this. If you are going to use stamps, stock up at the post office next time you are close by. Maybe tell the postal clerk what you need them for and they can recommend useful denominations.
Protip: When you click on "sell on Amazon" on an item page, you can see an item's Amazon Sales Rank. From this number you can get a general idea of how fast something will sell. If it's less than 10,000 it'll be sold in a couple of days. If it's more than 1,000,000 it may linger in inventory for a year or more.
Good luck!