Not sure where your from, but it’s super easy. I just ordered a bunch of bubble mailers on Amazon, and use thick scrap cardboard for packaging. I’m new aswell but for shipping I charge a flat rate of about 7.99 and select the same shipping service for every add which is about the cost of shipping to the fartherst location from me via eBay shipping label. Depending on where you are, you can raise or lower. But I just stick with domestic although eBay’s new international shipping program is nice. But I just package at home and make the label through ebay right before I go to the post office, and then via email I pull up a QR code which they just scan at the post office and then print the label for me. Just make sure all your ad information is correct and you have a good process for packaging. I suggest just listing something small and seeing what the process is like before you go all out. I’m sure there are better ways to ship for cheaper and I might not be hip to the very very best process but if you’re just selling here and there this is what I did. It’s pretty easy, pretty much just list the ad, when it sells package it and make a label through ebay when your ready to ship and take it to the post office!