There seems no direct bus or train from Nantong to Jinjiang. I advise you take a bus or train from Nantong to Nanjing(https://www.travelchinaguide.com/cityguides/nanjing.htm) first, then go to Jinjiang from Nanjing by air or by bus. You can check the China Flight Timetable(https://www.travelchinaguide.com/china-flights/) to arrange your trip.