Plant them in nutrient rich potting soil. The brand Miracle Grow makes organic potting soil.
When you plant those beautiful seeds, don't pat the soil down tight. For the most part keep it nice and loose and let time and gravity do the dirty work
Make sure the soil is nice and moist and don't let it dry out.
Oh and one more thing, sometimes tap water has too much chlorine in it, use purified or non mineral bottle water until you find out weather or not chlorine will harm you new Bonsai.