Just like a cooking receipe, your need the following:
A large poly box - you can get these from fish counters!
A decent sized heat mat
a mat stat
a shallow water tray
a grill or wire mesh to go over the tray
A food tub
vermiculite - damp not dry!
And a thermometer
I'll try to make this simple:
Make 2 x 1 inch holes on the box to let heat escape and prevent over heating.
Place heat mat on the bottom
then water tray ontop
then mesh grill ontop of tray
then a food tub with 2 small holes on the lid and place the mat stat sensor onside the tub, through the lid.
Set the temp anywhere from 82-85.
Keep an eye on the vermiculite, if it gets dry then place some drops of water around the eggs! dont get eggs wet!.
I think thats it, Oh dont place the incubator near a radiator or anywhere too warm.