First off, thanks for buying a CB animal!
Secondly, a picture would be very helpful. If the newt is a adult then it should be fine in deeper water, but if it is a juvenile then start with only about 1 inch of water and a lot of live plants, then increase the water level slowly over a few weeks time.
Here is a great care sheet written by a experienced keeper: Caudata Culture Species Entry - Cynops orientalis - Chinese firebelly -Seth