New Wal-Mart vendor? First, head down the street

* Former employees teach courses about Wal-Mart

* Classes include how to analyze Wal-Mart data

* More than 80 courses offered in 50 cities

By Jessica Wohl

BENTONVILLE, Ark., April 13 (Reuters) - It all starts with Walmart 101.

Companies trying to sell goods to Wal-Mart Stores Inc often find it difficult to figure out the best ways to work with the world's largest retailer, as each buyer has his or her own style and there are vast amounts of ...