I'm rubbish with plants but my inlaws bought me an orchid last year. I think they sort of grow in bark rather than soil and I just leave mine alone and water it about once a week while standing it on the draining board, apparentley you don't leave them in standing water so it has to drain out.
I keep thinking it must be much more complicated than that, try googling care instructions for them and maybe you can enlighten us all!!
Lynn