Yes, you need EAN UPC or ISBN as per your need to sell your products easily at amazon and all major marketplace. however you can apply for exemption which is not easy for sellers who is selling multiples of same items.
Easiest way to have EAN from codesforamazon website. which is cheap and easy to list items at amazon and other major marketplaces.
https://codesforamazon.com/product-category/barcodes/ean-numbers/
CategoryEAN UPC ISBN BARCODES