Q&A for How to Make a Shower Pan

This depends on what the surface is. If a sidewalk then I would use a total of not less than one inch thickness , and even the surface to what ever level is level. If the concrete is too thin, it will break. Water proofing is a good idea especially if the surface is outdoors.

Sand topping mix is typically used. It's a drier mix that allows you to slope the pan as needed.

Yes, that is the preferred method by professionals.

Sloping the shower step toward the inside can help with drainage, preventing water from pooling and reducing slipping hazards. It's a good idea for safety and keeping the shower area dry.