If I trade the forex market and I will hopefully provide a sustainable and profitable trading service, do I need to be licensed or something like that?
There are only 3 options being allowed to trade money of other people:
1. Pass a pro-course of an investment bank and/or an official registered pro-trader and apply for a license at your local financial regulator. Only after a proper license registration you'll be allowed to trade with clients' funds.
2. Take the broker of your choice and open a PAMM or MAM account on it. Other people will see if you're good and will then invest into your account.
3. Search for a good local prop-trading-company. If you're good they might invest into you as their prop-trader.