train reservation

Hello
I would like to make the journey kashgar turpan Beijing by rail: arrival dep 19h02 change 14h34// 12h44 departure turpan of turpan arrival beijing 20h20. the process of change is good? enough time ? . for this is June 1st I have still time to reserve trips (2 months in advance)?
often departing from turpan it n there is no place to beijing in soft sleeper
Is that the case?
otherwise can take your ticket urumqi - Beijing and boarded turpan for the soft sleeper?

can take your tickets already reserved here at the Kashgar station?

Thank you

patrick