They are germinating, in only about one week. That's s good sign. I've never grown coleus from seed, just cuttings. Back in 1970s when I was a child my mother used to buy these little pre planted trays of coleus seeds in potting soil, about 8"x4" and 2" deep. The top doubled as a dome and she would get so excited when they germinated. Then she would transplant in garden boxes my dad made to edge the patio. I was always amazed at how big those tiny seedlings grew. That's probably why I love coleus so.