Bus or High Speed Train to Terracotta Army?

Our hotel address is No. 12 Huancheng South Road in Xian. What subway line should we take to get to the downtown railway station to catch the bus to the Terracotta Army please? Also, is there an option to go by high speed train from downtown railway station to the Terracotta Army site? Does the Terracotta Army ticket include a Mausoleum? We will be travelling the end of October. Thanks.