How To Start Rice Mill Business How To Establish Business Contacts In The U.S. To Sell Rice ?

How to establish business contacts in the U.S. to sell rice ? - how to start rice mill business

I have an uncle, a rice mill in Canada and expects to sell its products in the United States they should contact the food retail market in the United States or the supermarket chains such as Wal-Mart, Giant, Safeway, etc. ? What is the best way to start the rice from my uncle, are sold nationwide in stores?