Hi. Sorry, but I will give you the answers in English. You can learn more this way.
get (or start/set) the ball rolling - to do something which starts an activity, or to start doing something in order to encourage other people to do the same
have a ball - to enjoy yourself very much
a whole new ball game - a completely different situation, often one which is diffcult or which you know little about
play ball - to agree to work with or help someone in the way they have suggested
the ball is in your court - if the ball is in sb's court, they have to do something before any progress can be made in a situation