Command Block Assistance

So in minecraft I'm AWFUL with redstone. And I really need some help with my command block contraption. So in my creative world I made a little box with a button I press to give me unbreakable diamond armor,a sword,and a bow. But I really want to know if there is a way to enchant the bow its to me with infinite while keep it unbreakable. Also I would like to know if there is a way to spawn a infinite stack of something. Thanks!