I think you need to register your organisation with the government as non-governmental organisation outfit. Then you can start a campaign for different causes and ask people to sponsor you for the events.
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I guess every country has its own rules and regulations for starting a non-profit company. In our country, you need a team of at least 7 members to start a non-profit organization. The organization needs to be registered in the district administration office. YOu need government IDs of the members, including no objection letter form the police department to get registered.