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How to install self-adhesive vinyl on screed?

We are planning to do self-adhesive vinyl in some rooms of our new building (with underfloor heating). The base of the floor is a cement screed. Now, after initial research, I'm confused about subfloor preparation, as well as any impact soundproofing (or is this only necessary for vinyl flooring?).

My questions are:

1. Does the screed under the self-adhesive vinyl need to be treated with a leveling compound over the entire surface anyway?

2. If so, what will happen to the expansion joints in the screed? How do I protect them?

3. What happens if I don't use a leveling compound?

4. What comes after the leveling compound? Directly self-adhesive vinyl or other impact soundproofing?

• floor
• vinyl flooring
• vinyl