For an incubator I use a fish aquarium heater. I bought 2 plastic storage tubs the same size. I filled one up 20% with water and attached the heater to the bottom with the included sucktion cups. The automatic heaters keep the water at 78f. I place the dry empty tub in the water filled one,floating on top. I used wild bird seed in quart jars.
In a nut shell I rinse seeds through a collander several times to get off chems. I take out all floater seeds ie:sunflower seeds. I then soak the seeds for 12 hours. I re-rinse then I let seeds dry for 1 hour and 3/4 fill qt jars with seeds. Place lids with holes in them on, and cover with aluminum foil. I pressure cook them for 40 mins, & let sit overnight. I use a glovebox and I inoculate the jars with a spore syringe. I use Z-strain because it is a fast spawning mushroom. It is not as potent, but you can get it to turn around faster for more "ADD" growers waitin on buds.
I place the jars in the afore mentions tub, and cover it with the lid it came with and a blanket to keep light out. 10 days to 2 weeks is about what it should take to get it completely caked. You will see white mycellium after about 4 days. When it gets about 20% spawned, shake the jars to get the mycellium to spread faster through the WBS. After 80% coverage stop shaking. This should answer your questions up to this point to the best of my teaching skillz! Good luck!
I added some pics to give you inspiration!