When correctly cared for, wooden boards and utensils are extremely long lasting and become more beautiful with time and use. They can even become heirlooms to pass down between family members. To clean, wipe down your wooden spoon or board with mild soap and warm water using a damp cloth then leave to air dry. Wood is porous, so try to avoid submerging or soaking wares as it may cause the timber to warp. Similarly, do not wash any wooden objects in a dishwasher as this will damage the timber.
You can use a board for cutting or serving, but cutting with a sharp knife will leave marks on it's surface. This adds character over time, but you may prefer to keep one side for cutting and the other for serving.
To remove any rough areas that appear through use, lightly sand over the surface using a fine grit sand paper (i.e. 400) and follow with an oiling. Oil the wood whenever it starts to look dry using a food safe oil and / or a beeswax salve. I sometimes sell my own homemade salve in my shop for this purpose, but you can easily buy the oil from most health food stores. I recommend organic raw linseed oil. Spread the oil evenly over the whole surface and let it sit for half an hour to an hour. This gives the wood time to absorb the oil and then you can wipe off any excess with a soft cloth.