Dear Elyas,
Thanks for contacting Top China Travel!
The metro line is quite limited in Xian so far(July 28, 2016). Please kindly find the transport guide to the places that you listed.
• Get to Great Mosque
Take Metro Line 2 to Bell Tower Station first, then walk westwards along Xi Da Jie Street, then walk northwards from Bei Yuan Men street and get to the Great Mosque via Muslim Snack Street.
• Get to Louguan Tai
Louguan Tai can not be reachable by metro. You may take Tourism Line 1 from the North Square of Greater Wild Goose Pagoda to Louguan Tai Station and then you can walk tehre. It takes about 2 hours on the way.
• Get to Terracotta Warriors Museum
The most convenient way to get there is by bus. You can take Bus Route 5, 914, or 925 at the East Square of Xian Railway Station to reach Terracotta Warriors Museum directly.
Any further request or question, please feel free to contact with us.