Just toss them into the tank, that's all I do with mine and after about 6-20 days you should start to see the plant itself starting to grow out of the bulbs. Mine normally start to sprout out of the bulb after about a week or so.
they like to be planted very shallow. I basically just set mine on the substrate and pushed it down till aout half of the bulb was buried. Once it starts growing it will adjust itself to a depth that it like. Mine now sits pretty much on top of the sustrate now.