If you want to make music professionaly, it means you have to invest. You invest time to practice, for rehearsals and performances. You need to buy and maintain instruments, rent a studio to rehears and spend money on publicity and promotion. It might take a while before you earn enough income by making music.

There are many ways to support (a part of) your costs financed. You could also find a sponsor or obtain a subsidy to provide you with the funds you need. 

Subsidizing bodies and sponsors can support you or your project with cash or in kind. Neither is any more difficult to find than the other. It may well pay you to try both. Investigate which subsidizing bodies and sponsors are best suited to your project. Every organization has its own objectives and conditions. 

Subsidies 
There are many funds and subsidizing bodies you could approach. These range from a few well-known major organizations, public and private, to many hundreds of small, mostly private funds. The amounts available vary from a few hundred euros for an individual or a project to many millions in structural support. Applications for the latter always far exceed the money available. But there are also lesser-known funds with cash to spare because they do not receive enough good applications. 
Read more about subsidies

Crowdfunding
Crowdfunding is used more often to finance projects. It is a construction in which the intended amount will be collected by a lot of people who each donate a small amount. In exchange the donors are involved in the project in a special way.
Read more about crowdfunding

Sponsorship 
A sponsor provides money or material support in order to put itself in a good light. Large sponsors generally link their names to major projects and events. Small-scale sponsorship is generally easier to arrange, can save a lot of money. It can generate good publicity for both.
Read more about sponsorship

Cultural policy
How does cultural policy work in the Netherlands and how does is effect the art sector?
Read more about cultural policy in the Netherlands