Many independent musicians have managers. A successful music career can be a very complex operation, and there are plenty of examples of indies who employ a manager—or even multiple managers—to help them run things.
However, unless your music career has reached a high level of success, you most likely do not need a manager because you already have one—you! You are more than capable of managing your own career in its early stages.
Many musicians want to find a manager early in their career to help them become famous. But it is not a manager’s job to make you famous. It is your job to make you famous. It is a manager’s job to help you manage your fame once you have it.
Be suspicious of anyone who says that they will make you famous if you make them your manager. These people almost always underdeliver on their promise and can exploit you with predatory contracts.
When your career is at the point where you are ready for a manager, you won’t need to look hard to find one. They will be readily available. Just remember to have an experienced entertainment lawyer review and negotiate any management agreement before you sign anything.
Best of luck!