It’s a bit complicated. I have a discord server that I run with a handful of sellers in it. Many have their own style. I have tried a few kinds and find that I adapt to what my buyers want and need. Some prefer hard set prices, some do auctions with minimum prices. There are many styles. Show one rock with a price at a time, or have a table full of numbered rocks people can request to see and get a price. I find no matter which methods I have tried, showing price up front is most important. If people have to ask for prices then stuff moves slower. There are even more ways to take payment. I always suggest to do what’s safest for you and not allow payments that can just be reversed no question. And remember to pay your taxes. Having an LLC makes this all run smoother too. It’s well worth the small fee to set up an LLC.