in an incubator, never done it myself but different species hatch at different rates so you will have to have a read about it and see how long they'll take and what temps they need to be incubated at, good luck!
They are very easy to make. To make the one I've used you'll need...
2. Heat Matt
3. Matt Stat
5. Cricket boxes
6. Max/Min Thermometer & Humidity reader!
Ok this is how it goes together.
1. Put the heat matt in the bottom of the polybox.
2. Mix some water with the vercumilate until it squeezes together. Cover the heat matt with the vercumilate (about an inch worth). Fill some crix boxes up with the vercumilate as well. Put small thumb prints in the vercumilate for the eggs to sit in. Make sure they are far enough apart so the eggs can expand.
3. Put the stat probe on top of the vercumilate in the poly box and sit the crix boxes on top of that.
4. Put your thermometer probe inside the vercumilate in the crix boxes. This is the temp the eggs will sit on after all.
5. Play with the stat until you reach the correct temperature so you eggs will cook properly.
My temp was at 84f for beardie eggs and I sprayed the eggs every other day to keep humidity up (this helps the eggs expend!). My stat is set to 92f to reach the temp in the crix boxes. I'll see if I can find a decent picture as it'll make more sense then!
Many people make them differently but they all seam to work!
Failing that you can buy one but they cost a fair bit.....