For you, if you open a shop in partnership with a friend, the dividend should be consistent with the investment. You pay 70%, then you get 70% dividend and the other party gets 30%. In terms of wages, whoever looks after the store in the store gets paid.
There is also a compromise that you can discuss. If you think that you have less time in the store and your friend looks after the store harder, then you can give your friend more bonus or salary. So that your friends can take care of your business more carefully. In order to prevent future disputes, it is best to sign an agreement, and any details must be mentioned first. This is also a responsible approach.