is any there any coaches or refferees or whatever in playing badminton?

Answer 1

Yes, for official tournament, there are umpire, line judge and service judge. In small tournament, they may use only an umpire and two line judges. Up to 10 may be used in the big tournament per match. In preliminary match and small tournament, players may call their own line. Basically it is similar to tennis where you see a chair umpire and line judges. There is however, no shuttlecock boy in badminton (unlike ball boy or girl in tennis).

Answer 2

Yes.

Officials
An important part of badminton are the rules. In most matches the players are expected to know the rules and abide by them. Having a legal serve and properly calling the shuttle in or out are examples of this concept. The players are the officials of their games and when a problem occurs, the players must work it out themselves. Players are expected to be good sports and make correct calls and play by the rules. Players who break the rules take an advantage over their opponents.
Umpires and Service Judges
In tournament-level play, some matches will have an Umpire to officiate, especially as the matches get closer to the finals. The umpire is on the court to ensure safe and fair play plus keep track of the score and determine a winner. The players often are asked to assist the umpire in making calls of in or out when the shuttle lands, although the umpire does have the final say. The umpire determines lets (the point is replayed) and faults (loss of point) and looks for illegal serves. If the umpire or a player suspects that someone has an illegal serve, a Service Judge would be brought to the court for the duration of the match. A service judge is simply another umpire who is trained to identify illegal serves. The service judge watches all the servers and calls “fault” upon seeing an illegal serve. Upon hearing the fault call, the umpire reports that a service fault has been called and indicates the next server and the score.
Line Judges
International badminton tournaments such as the World Championships and the Olympics have strict policies that require all matches have an umpire, service judge and Line Judges to officiate. Most badminton tournaments use line judges especially at the final matches. Calls of in or out are taken out of the hands of the players when line judges are used. Line judge calls may not be over ruled although a line judge that makes repeated bad calls will be replaced at the discretion of the umpire after conferring with the tournament referee. From two to ten line judges are assigned per match. With two line judges only, these people stand outside the opposite corners of the court and are each responsible for a side line and end line. The umpire would be responsible for line calls on the short and center service lines. Any combination number of line judges can assist the umpire with the calls. Olympic and World Championship matches use the maximum number of ten line judges (five per side) for each match. The umpires make no line calls.
Referee
Since officials make all the decisions in these really important tournament matches, players are frustrated when calls go against them. Players have no power to change a decision once it has been made, but can question the rules related to the decision. An example might be a situation when the umpire calls fault on a player for reaching over the net. The faulted player may disagree and want an explanation of what happened. The umpire is responsible to explain the situation as quickly as possible so that the match can continue. If the player is still not satisfied, a final appeal can be made to the tournament Referee. The referee is responsible for the overall play at the tournament and is someone with many years of umpiring experience. The referee would come to the court, listen to the appeal of the offended player and then confer with the umpire. The referee and umpire determine what should happen next. The umpire would announce the decision and get the match started again as soon as possible. If the offended player refuses to start play, he/she will be penalized. Umpires have the option to fault a player who refuses to play, and can notify the referee who ultimately has the power to default the player from the match.

Referees are also responsible for the fairness of the draw, ensuring that the appropriate guidelines for seeding and placement of Byes has been followed by the Tournament Director(s).

Like many other sports badminton requires officials.

Answer 3

No.....