Lexani 18x8 Wheels and Tires, Small Bolt Pattern $500 obo
The best way to sell them is to find out what they truly are (like I said, they may be marked on the back) and them put them on Craigslist or fakebook marketplace
They don't look to be in bad condition so you shouldn't have an issue selling them, IF you can find the right buyer, and that means knowing what they are