White-labeling Products

Hey! Does anyone have experience with white-labeling products manufactured by a third party? I'm particularly interested in men's clothing/apparel products.

I'm not sure how to pick the right/good manufacturer and how to store the products. I'm not from the US, but I want to sell there. How can I transfer them to the US?

If anyone can guide me through the process or recommend a good course/tutorial, I'm happy to pay for the course/service.

Thanks!

p.s. Not sure if "lounge" is the right category, but it seemed best to me.