You might want to get rid of the moss, or at least most of it.* Moss grows where there is moisture, acid soil and shade.* Incorporate the pine needles and any leaves into the soil.* Add some lime to raise the pH of the soil and discourage the moss.* More sunlight to the bed, if you can do that by limbing up or thinning out trees, will also help.
Have fun planting.* :)*
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.