how do we arrange transport and accommodation to the grassland at xining

The closest grassland is the Jinyintan Grassland (Gold and Silver Grassland).
To reach there, you need to go to the XN Long-distance Bus Station to take bus to reach Haiyan County. Upon reaching that county, you can take the local public bus to reach the grassland.
For living there, there is a cultural park on that grassland, so you can live there.