What do marketplaces make money on?

[luckypenguin]

There are many marketplaces and each one has a different business model. Share the ones you know about.

[boyptc]

There's really nothing to share about as you seem to know their business model, they earn from the share and commission from each product, digital or not that has been sold.

And that's how they mostly earn, in the forum, there's commission.

[luckypenguin]

How do I create my Amazon?  What do I need to create a marketplace?

[boyptc]

How do I create my Amazon?  What do I need to create a marketplace?

Knowledge.

Since you don't know yet, taking time to invest about how you would do it. Start with those blogs and articles of how you must do it but instead of making your own marketplace.

You should be starting your e-commerce journey.