Pickleball is the fastest-growing sport in the United States.Rich Legg/Getty ImagesMy friend and I decided to start an eCommerce company on a $10,000 budget.One of the first steps we took was selecting a product to sell.After consulting experts and using data from Helium 10, we chose pickleball paddles.When my friend and I committed to building our own eCommerce business, our first task was selecting a product to sell.We knew we wanted to create something of our own (rather than use an arbitrage model and buy and resell an existing product) — and that was about it.There were infinitely many directions we could pursue.