If they are really difficult plants to germinate or really small seeds, I pull back the mulch and sprinkle them directly on top of the soil and apply some pressure or pat them in to get good soil contact which seems to help a lot with germination.
Each variety of plant seems to have its own preffered germination environment, more hot or cold, or moist or dry, and I found
https://www.westcoastseeds.com/ to have a lot of good information when I was looking for this info recently.
Some difficult to root plants supposedly need light to germinate also, which is another reason I sprinkle them on the surface of the soil. Hope you have lots of baby plants soon!
