The Crayola Dry Erase Poster Set is a large re-usable sticker that goes up on your wall!
The best thing about it is that it has correct lines for the beginning writer (many products do not). It is a large size, has many lines, and is easily erasable so your child can spend a lot of time writing. I would suggest using dry erase pens that are washable just in case your child gets them on their clothes (or worse, the wall). These pens easily come off of skin and the white board:
Remember that when you clean it DO NOT use water! I leave my husband's gym sock next to it so the kids can put their hand inside and easily clean the board. If dry erasing does not get all the residue off, then try a dry erase specific cleaner such as this one: