Designing the piece
The fixed and moving layers should each make sense and reveal a useful change when the slider travels. Keep the path simple, protect small details from the moving part, and use the interaction to support the idea rather than distract from it.
Start with the artwork and intended use
Send the logo, sketch, or reference image together with the intended use, quantity, delivery country, and target date. These details give the team a practical basis for artwork review and a focused quotation; any undecided choices can remain open for discussion.