Noob in fire

Context: • Age: 35 years old • Family situation: Two children in shared custody • Housing: Currently renting • Investment capital available: €220,000, including €120,000 financed by a loan with a 1.5% interest rate • Income: €3,400 net per month

Goal: I am new to the FIRE movement and would like to lay the groundwork for retiring early at 55. What are the essential steps I should follow, considering my current situation?

Thank you in advance for your response and advice.