By Alex Prewitt The first-time Olympian got his skating start on his family’s backyard pond at age 5. Now, on the heels of a breakout season, he enters Beijing as a legitimate medal contender. BEIJING — Jane Stolz is a dental hygienist by trade, but over the past dozen years she has also become an expert in automotive interiors and ice rink parking lots. “I sleep, eat, work, do my taxes—everything—sitting in my car,” she says. Whatever fills the hours until another practice ends. On this afternoon in late January, however, the Kewaskum, Wisc., mother of two has just returned home from nearby M…