I am not familiar with your specific type of newt, however I have read on here about making egg-laying strips if you don't have plants in your tank.
You can take a small stone or river rock, or in the picture they used some type of brick piece, and use that as the anchor for the strips. You can cut strips from a sturdy plastic bag like the kitchen ziploc kind, or I believe they used packaging tape and folded it over on itself to make the skinny strips. The strips were then rubber banded to the anchor. It would be easier to do a search for the egg-laying strips on here I think, than to try to explain it, as there were nice step-by-step directions and pictures, as well as measurements.
You may find that you want to add some plants. I have added some plants and they are a wonderful addition! They don't need any special substrate or attention, and they should do well as long as you get the right kind for the set-up you have, and have an aquarium light you leave on for at least 8 hours. I just have medium to large gravel and smooth river rocks holding them in place. They are large enough that my newts would not be able to swallow them.
Here are my top picks for plants:

(I got my plants at Petsmart, and they are guaranteed snail free!)
These are for either terrariums or aquariums not necessarily in order)
1) They have an aquarium grass in a tank that is versatile and I forgot what it is called. ($1.99 ea.)
2) Gold Ribbon Plant (12" 2-4 live plants for $9.99, smaller available)
3) White Ribbon Plant (4" 2-4 live plants for $3.99, larger available)
4) Kyoto Grass Plant (4" 2-4 live plants for $3.99, check sizes avail.)
Aquariums only (put in the water area):
1) Aqua Fern Plant 2-4 live plants for $3.99, check sizes avail.)
Plants are not only aesthetically pleasing, are a natural place for your gravid newt to lay her eggs, but also helps reduce waste chemicals such as nitrates in the water. Have fun!:happy: