If you have new idea, how to make others support your idea?

First : Marketing

2nd: if its a commercial idea i will have to show the feasibility study to show the poeple around that my idea worth it.

You must first analyze your idea, sift through it to see if it is likely to see the light, to be concretized and above all to hold the road.

Before embarking on anything, it is obligatory to make an appreciation of the situation, to ask questions you about your project idea, questions about the welcome that customers will retain to your product and to which you it will have to answer.

You must have the ability to argue to convince of the reliability of your project.

You must be trustworthy,  master your subject "idee",

You have to present a very good and very defensible file.

You must present your idea, explain, demonstrate, compare, make appreciate and convince,

Know that the best way to drag someone is to follow him in his point of view until a certain point and then slowly bring him to yours, often without realizing it.