Surely, the place to start is not with the OpenGL implementation, but with the physics?

Get your algorithm for star formation sorted first, using a random cloud of particles (or a defined initial state) and process it until you end up with a star, or something vaguely recognisable as a star. Worry about the presentation when the damn thing works in the first place!

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It would help, if you edited your question to make this clear.

"i dont understand that math involve... i was told that i hav to use some formula but i dont know where to start. I was thinking to create one particle and then generate it using a random function but that is not working so far...

Hope i have helped in clearing up the question...

Help!"

I deleted your fake answer. Use "Improve question" to go back and add more information.

A start would be to find out, which formula you should use - "some formula" is a bit vague, don't you think so?