Adobe manages the rights for you. But as soon as someone bought the image, he is free (technically) to use the image as he want. The user can also (not always in line with the license) make the image available to a third party. But as long as the image is not bought, you can only download a watermarked small preview of your artwork.
You get a percentage if the sales. The real amount is dependant on the subscription the buyer has. The more he pays, the more you get. Adobe collects your royalties and will pay them out as soon as you reach a certain threshold.
Adobe sells your images worldwide. And you have no influence on the regions where the image is available. The only influence you have is deleting the image after it has been approved.
Please read carefully the quality and legal requirements before posting an image. Adobe is quite picky on quality and any missing property/model release will result in refusals. Also IP violation is a common ground for starters to get refusals as any visible logo or identifiable scripture needs to be editited out: business names, logos, even colours and forms will sometimes trigger IP violation (eg Coca Cola bottle, Fendt-green machines).
It is advisable to start in small steps, to get a feeling of what gets refused and what gets accepted.
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