Here i will explain you how the point system works in singles and doubles, so you can erase all your doubts and can starts to play now itself.
In singles server and receiver stood diagonally opposite service court , server hits the shuttle cock so that it reach receiver court as in Tennis but it should be below his waist height. When the serving side losses the serve, next serve is passed to the opponents. Server stands in his right court when the score is even otherwise on the left court.
In doubles, if the serving side wins , same player continues to serve but change the court so that getting different opponent each time. If the opponent win and their score is odd, then player in the left service court will serve otherwise the player in the right court.
Match starts with a toss to determine who will start to serve or for selecting the court. Then game will progress whenever win a rally the team gets one point till reach of point 21. Suppose for a particular situation where each team reach 20-20, then match will continues till one team gets two points sequentially , that is till getting two point lead.
Generally one match contain three games, team getting two out of three will be the winner.