I'm not exactly a newbie to bonsai, I've usually had a tree (mallsai usually

) at all times, but I've never started a tree from a seed. Well, I just ordered some dwarf pomegranate, heavenly bamboo (nandina domestica) and chinese lantern seeds off of eBay, and I'm wondering how I can get them to germinate. I've heared about cold stratification, but I've never tried it and wondered if anyone could give me some hints on how to do it well for those species. Thanks!