Includes licenses and insurance is regulated by each Member State.
Looks like you are trying to be an insurance “broker” versus an “agent”. Dealers sold for many companies selling agents.
The insurance currently holds licenses. To my knowledge no one may simply throw a sign and an officer to be. If you are really interested in some of your local insurance companies and ask them for their first job.
Then, after collecting a license, and experience, you can try to do it yourself if your condition allows.