You tie the moss and fern onto the wood (or rock). Over the span of 2-3 weeks it should be adhered to it and will grow to eventually cover it. How long depends on your system (lighting, co2, ferts, etc), and how big your wood/rock is.
For lighting, as John said, that's not for plants. AH has some great stuff, check them out. Beware, however, the higher the amount of light you use, the more important it is to have the other parameters (co2, ferts, etc) in line, or else it's algae time.