I feel the same way as you. My main worry is that I don't know the market and products. I suggest you try my method:

Learn from customers and competitors with an open mind.

Honest and trustworthy, establish a good personal image.

Studious and thoughtful:

Familiar with product performance and selling points.

Understand the products and prices of competitors.

Identify your sales customers, understand their needs and meet their needs.

Be bold, not afraid of setbacks and failures, and stick to it.