Well, start from Urumqi, stay one day in the city, and transfer to Korla, where you can visit Tiemen Pass, transfer to Kuqa, an important city of Buddhism along the silk raod, and visit the Kizil Thousand-Buddha Caves, transfer to Aksu, stay at Aksu for half or one day, and transfer to Kashgar, where you can visit the Id Kad Mosque and local bazaars, Abakh Khoja Tomb and Karakuri Lake, transfer to Hetian, the city of Jade and return to Urumqi.

Of course, there are more scenic spots to explore along the silk road, you can check for more information, and have a nice trip in Xinjiang.