About three years ago I had 4 pine trees cut and cut into lumber. Now I am trying to build some bee hives with the lumber. I had it cut to actual 1 inch and 4 inch and so on. So I went out yesterday and bought ($340.) a planer to clean it up. Now I hear i need to buy a Joiner. I don't know what it is much less what it should do. The longest piece of lumber will be less than 20 inches. So what does it do and do I really need one?