please advise me for getting VISA and expense of two years in China to get master degree

You should apply for an admission letter from your selected Chinese university first, and then apply for a China student visa with the help of the school from the China embassy in Afghanistan. You may ha ve to go to the embassy to apply for the visa in person.

If you will study for art subjects, the tuition fee is US $2,200-3,700 per person per year; if for science, technology, agriculture, medicine, sports, the tuition fee is US $2,600-7,400
per person per year. The cost of living also varies from city to city.

In a word, I advise you fix your university first, then the school may tell you all what you want.