In general they should. In some styles it is considered critical to the point that extra steps must be done to return you to the starting spot before ending the kata. In some styles it is not considered that critical and it is not part of the judging criteria.
yes
You short start with karate if you have never done any kind of martial arts before.
yes
You should always finish your pack You should always finish your pack
Star distal & work proximal
It depends on the individual boy. Some boys started when they were three.
As old as you like! It really doesn't matter. But its probably better to start out young, to build up strength.
Mixed Martial Arts is martial arts, which should be obvious from the name. Over time all martial arts are very similar. While they start with different focus, they eventually blend together, as the human body can only move in a limited number of ways.
"Martial arts begin and end with courtesy" - Mas Oyama
Martial arts predates written history.
How do you start and finish a transaction in DBMS?
They start at 2 and finish at 62