Has your female laid eggs yet? You really need to watch her diet and temperatures so she won't produce huge clutches which lead to follicular stasis, eggbinding, MBD and even prolapses.
I made my own incubator so I'll leave it to others to tell you about the incubator.
The substrate I use in the incubation containers is the COARSE grade of vermiculite. I make it just moist enough to htat if you take a handful of it you can only squeeze out one or two drops of water.
I use shoebox sized Tupperware type containers. Fill them about half full of the moistened vermiculite once she is laying the eggs.
I make dents in the vermiculite with my thumb for each egg and space them about an inch apart in all directions.
For veileds, I incubate the eggs at 74F. (Slightly higher or lower is ok too.)
You leave the eggs in the incubator until they hatch (or rot if they are infertile, etc).
Please be sure that the container lid is not taken off for long, when you check in them...you don't want the eggs to dry out. I only check once every two weeks for the first month and then maybe once a month after that....for a couple of seconds.
If you need to add water (and you really shouldn't if you set it up right in the first place) do not pour it over the eggs...add it around the sides/edges of the container. The eggs are said to have a protective coating and you don't want to wash it off.
When you dig the eggs up to put them in the container, do it carefully. I try not to turn them but I don't think it matters as long as you dig them up soon after she has laid them.
Don't forget that once they hatch you need lots of small insects, several setups to house them in, lights, plants, branches, etc, etc...all the stuff you need for the adults. You'll have to clean all those cages, etc too.
This is something you need to be prepared for.