Green Crack Auto Indoor

Two Green Crack Autoflowering seeds were put between wet paper towels, enclosed by two plates and put in a dark and warm environment. Spring started yesterday and temperature is around 9°C outdoors. I have the heating running in the house but I'm not sure what's the current temperature indoors. I placed the seeds in the TV cabinet on which is probably the warmest room of the house right now. Next week's temperatures will reach more spring-like values. I overfed one of my previous plants and it resulted in a sub-par harvest in comparisson with the rest of them. This time around I'm going to be more careful with nutrients and I will pick them more consciously. I'm open to suggestions on soil, feeding, watering. I went for coco and regular compost in the past but I'm willing to try other substracts this time around.