Most of the money made in a band comes from the publishing and exploitation of songs. If there is a primary songwriter or songwriting team the sharing of publishing should be discussed. Knowing about legal fees, record company advances and recoupment should quell any excitement that you may have about possibly getting rich in this business. It takes an enormous amount of record sales to be considered a financial success in the land of major labels. There are various formulas used by bands all over the world to deal with this.
Some bands share in everything but the songwriters share of the publishing.
Whatever works for you is right, but make sure it is openly discussed and decided upon as soon as the band becomes a viable entity. It's nearly impossible to work out these delicate matters after the fact. Try to approach issues democratically realizing that as long as you are aesthetically and philosophically on the same page forward motion will continue. Take a more humbled viewpoint, which in my opinion is the the constructive one, and realize that no relationship is perfect, no plan is perfect and that long-sightedness and generosity in spirit will lead you to see each gig, recording and experience not as an insurmountable obstacle but as another paving stone on the road to a successful career . Reproduction without permission is prohibited.