Philipp.
Please feel free to PM myself, if I can guide you in the right direction I would be more than willing, though as I outline to anyone considering such a move you need to look at what type of person you are and suitability.
Communication and common sense are two of the key requirements.
Focus on what transferable skill’s and experience you hold that could be applied coupled with a non aggressive approach.
Most of any role is understanding, being able to mitigate risk to an expectable level , conduct a detailed rolling risk assessment, threat analysis, gap analysis, viability assessment and potentially cost analysis and a series of options.
Lose the idea of all these courses that some potentially have suggested, it’s about you and the way you handle a given situation.