The short list of what has to be in place.
To buy
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Access to the Marketplace in your side navigation
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A payment card, for anything that is not free
That is all. There is nothing to set up.

Where the Marketplace lives. Sell Template and My Items appear only once your account is allowed to sell.
To sell
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Permission to sell — ask your company administrator. The Sell Template and My Items tabs appear once you have it.
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A connected Stripe account — see article 11; this is how you get paid.
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Something to sell — a preset, template or AI prompt already built in your account.
Tip
Do the Stripe connection first. Building a listing and then finding you cannot be paid for it is the wrong order.