profits

Hi, new to the forum. I've searched the first 10 pages and can't find the answer to a couple of questions.;

I would think that there is one or at most two visionaries in any rock band The creative forces that actually write the songs.
How are percentages usually broken down with rock groups?
For instance I have been writing songs for 10 years and am just looking to form my first band, which I plan to sing and already have all parts to all songs on my Cubase with midi instruments.