How to get new skin care line in retail stores?

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How can a start-up get its skin care line in retail stores?
I am in the research phase on how to get a start-up skin care line in traditional brick and mortal retail stores and have a few questions from people that have done this:
1) Do companies usually work directly with distributors or have independent road reps?
2) Are there any companies or agencies that people would recommend for either?
3) What is the percentage range that either generally earns?
4) What is normally used to "pitch" retailers (samples, lookbook of products, etc.)?