How do I start ?

Hello everyone, I hope you are doing well and that your entrepreneurial life is successful. I have an idea I believe in 1000%, I want to develop it and see how can I execute it. Problem ? I don’t know where to start and what to do first .. finding a co-founder ? Developing a brand identity ? Working on the tech (app + website) ? Build partnerships with relevant market stakeholders ? Any advice is appreciated, whether it’s general or some tool or framework recommendations ! Thank you all