Being bare foot into a dojo is important. It's a part of tradition part of being clean.
The shout (kiai) is also important. Theoretically speaking, if your opponent become frightened by your kiai and he / she runs away and you don't have to fight you win. Of course, if your opponent is another kendo practician he / she won't get frightened and your opponent won't run away but you cant get his / her attention to get a point Shouting the name of the stike is also important - people need to know that you are striking the bogu part what you want and that hit is not a mistake.
You also need equipment. We can give you the shinai or the bogu in the beginning but in time you have to buy your own equiment.
There are also a few other things, and you can learn some of them when you come first times at the kendo practice or in time.
