Ed Koczan used to play “shopkeeper” when he was a kid and he’s made that childhood dream a reality with his new store, Pop Junction, a small-batch specialty popcorn shop in the heart of Westfield. Koczan, a Westfield resident since 2012, has worked in sales and marketing and said he started looking for business opportunities a few years ago. He considered a variety of options, from construction to LEGO resale. But then, he said, he and his wife were watching a documentary about a popcorn business.