eBay can and will take fees from you. They will also withdraw funds if, for example, a buyer claims an item is damaged or not as described and you don't take care of the issue with a return or a refund. The buyer doesn't have to be right or prove anything. All they need to do is file a claim. They're covered by the Money Back Guarantee which falls on sellers' shoulders, not eBay's. There's advice you'll hear a lot: if you cannot afford to lose it, do not sell it online. If that's not something you can live with, then online selling is not for you.
You're thinking of selling collectibles so packing items for shipping will be very important. You'll need appropriately sized boxes and bubble wrap. You'll also need to know the item's weight after it's properly packed so you can charge an appropriate shipping amount.
Funko Pops, unless very valuable, would be best shipped with USPS First Class service. The post office will not pack items for you, and those free boxes they have at the PO are not only the complete wrong size for Funkos, but they require the purchase of more expensive Priority Mail postage. Anything under a pound you'll want to ship First Class.
If you want to give this a go, come back and ask more questions. But be prepared to get a scale and packing materials before you consider listing anything @starwarsfanatic1138.
Your post indicates that you're not comfortable with any of this. If you're not that's fine - there are other options like selling locally for cash. But if you'd like to give it a try and want to learn, we'll help.
