I planted my broccoli, cauliflower, gooseberry, and tomato seeds once they germinated in the filters. I carefully plucked them from the filter and put them directly on moistened soil-less mix then covered lightly with more soil less mix. That then went under the lights. Plants popped up and are very happy.

HTH

Here is a link that might be useful: Here's some instructions with pictures

HTH covered it well - transplant as soon as they sprout (they won't live long on the filter) and use any soil-less mix you want.

If you want more info I have linked numerous "baggie method" discussions for you below. There is also a FAQ here on how to do it.

Dave

Here is a link that might be useful: Baggie method discussions