Well,
You know what they say--the quickest way to make a million in the marine industry is to start out with TWO million.....
Is he looking to market/mfg a product (line of products) or start a biz reselling/retailing products?
As a mfg--best advice--make sure you have factored in co-op advertising in your profit goals---and then when you come to that number--add some more in. Most new products are picked up by major retailers based on their co-op contribution---like fresh cut fish in a chumslick---rings their bell every time. Once you get support from the major companies, then either the product will take off and fly---or die.
As a retailer---good luck. Internet is killing the retail business.