Here's some information that I hope will help!
I would remove the moss...it could !ead to an impaction if he ingests it. I would also remove the fake plants too...veileds eat vegetation and if he eats the fake plants it can lead to impaction too. Pothos, hibiscus, ficus, any non-toxic plant that you have washed... both sides of the leaves ...is fine to use. It helps with the humidity too.
He will need a basking area in the mid 80's F. You can use a regular white household bulb for this. If your house is warm enough younwont need this light on. Appropriate temperatures aid in digestion and thus play a part in nutrient absorption. He also needs a source of UVB...either sunlight (not through glass or plastic) or from a UVB light. I recommend a long linear Repti-sun 5.0 tube light.
For water I recommend misting the cage several times a day long enough that he will drink and a dripper. The dripper can be a tall deli cup with a tiny hole in the bottom so that it drips at the rate of one or two drips per second.
Since most feeder insects have a poor ratio of calcium to phosphorous it's recommended that you dust the insects at almost every feeding with a phosphorous-free calcium powder to help make up for it.
It's recommended that you dust twice a month with a phosphorous-free calcium/D3 powder tomensure that he gets some D3 without overdosing it and leaving it to produce the rest from its exposure to the UVB light. This likley isn't needed if he's outside a lot.
It's recommended that you dust the insects twice a month with a vitamin powder that contains a beta carotene prOformed source of vitamin A. This is safe because prOformed sources won't build up in the system like prEformed will...but it leaves it up to you to decide if/when he needs some prEformed.
It's recommended that you feed/gutload insects such as roaches, crickets, superworms, locusts greens, veggies and a bit of fruit such as dandelion greens, make, endive, escarole, carrots, squash, zucchini, sweet potato, sweet red pepper, berries, apples, pears, melon. He can also be offered these same things cut upminto appropriately sized pieces.
Hope this helps!