Yes for some leagues and no for others
You join a sport by either signing up at school or asking an adult
By being drafted, attending an NBA team tryout, or being signed as a Free Agent.
you had to work for it no matter what but you just had to work for it everyday and also IMPROVE your skill to join every years
It depends on which sport you want to join, but generally, you just show up at an activity and tell them you want to join.
a dog
invent a new sport!! or join a club
you can't encourage someone to join sport because it is a matter of there own free Will. therefore its not your choice. however people can want to join sport by seeing professionals playing the sport or doing a crazy stunt and the viewer will decide that he wants to join it because of his hero.
Join a club or take classes at a leisure centre. It isn't a safe sport to learn without support from a qualified coach.
to have fun :)
You don't.
You can join the cricket board of your country or you can join different cricket clubs