without seeing a pic, the brown fluffy stuff is probably diatoms. very common in a new tank. remove what you can manually (toothbrush helps), the rest will go away by itself in a week or 2. when it's gone clean your filter.
the white stuff is probably some sort of new tank fungus. might have got into the tank via dw? same story is as the brown stuff. it will go away on is own accord.
adding more plants is a good idea. they suck up more of the nutrients.