The water germination consists of putting the seeds in to a jar or container, with about two inches of water. If using natural sun, I suggest putting a shade cloth up to prevent the seeds from cooking. Once germination is visible, put the seeds on their sides on to your soil mix. Make sure that your soil mix is very damp so that the seedlings can adjust easily.
Try to keep them warm, but not too warm. DO NOT COOK THE SEEDS
You can put the newly germinated seeds right on to your regular soil surface. Peat/Perlite, Peat, Peat/Perlite/Sand.
Just rest them on the surface. I don't know if putting them roots-down would be beneficial or not, but the roots should find their way down due to gravity.
I hope this helps Waterbutt!