What do you mean by “what will be happened”? Your work will either be accepted or rejected.
In general, the requirements for vector artwork are more or less outlined on these two pages:
Vector do's and don'ts
https://helpx.adobe.com/stock/contributor/help/vector-dos-and-donts.html
and
Vector creation best practices
https://helpx.adobe.com/stock/contributor/submit-your-content/submit-vectors/vector-creation-best-practices.html
Following the recommendations on these pages doesn't guarantee that your work will be accepted, but it significantly reduces the chances of rejection. Try reading those two short pages - you should find your answer there.
If I were to give some more specific advice, I would say to remember that artwork should have “visual impact” - in other words, it should be visually appealing and look coherent and well put together. It should also not contain hidden or invisible elements/layers that are not visible in the preview, and the document structure should be clear and clean. The buyer is purchasing exactly what they see in the preview, and the artwork itself should be properly executed.
As for regulating more specific technical details of how the artwork should be structured, I don't think there is much point in doing that. That is ultimately your own approach and your own understanding of what you want to sell.
One thing I would add from my own perspective: it is 2026, and the idea of making any meaningful money from icon sets is about ten years out of date. Personally, I am rather skeptical about it, but - give it a try...