What's the best way to structure a startup (global online and offline sales) to reduce tax burden? How and where should we create business entities?

Our company (our own niche brand of leather goods, currently with a limited company in Hong Kong) will initially sell online only. Most customers will be in the US, although we will accept international orders. In a couple years we hope to sell wholesale to brick and mortar stores around the world. Our objective is to reduce our tax burden, and we understand that non-US sales are taxed quite highly in the US. We also understand that HK companies without any operations in HK are not subject to income tax. We suspect it's best to have a Hong Kong parent company with a US child company. The Hong Kong parent company would be linked to all of our sales (online and non-US offline) EXCEPT our US offline sales, which will be under the US child company. The two…