I earn 1,500 euro from Twitch, too little to report independently, what should I do?

I earn 1500 euro a month through Twitch, Youtube and Patreon, but that is not enough to report independently, I also wanted to move to a shared apartment with 3 other people in 2 months, what should I do? Who can I contact, what do I have to consider?

What is the name of your Twitch channel

Even with 1,500 euro you have to register a business.

It is already clear to me, I also do not spend any of the money so that I can pay it later.
So I would theoretically have to register a business, but what then?

Then you have to make an income tax return each year stating this money (along with your other income). You will then be told what taxes you have to pay.

To register for business, you must also report to your local community and to the tax office. They are both generally quite helpful and also tell you what needs to be done or not.

Register business with the municipality. And quickly! You should have done that a long time ago, and some are offended if you follow. Costs around 30 euro.

Otherwise: State your earnings as independent income with your tax. It has nothing to do with your flat share.