Entrepreneurs, what's your process from idea to action plan?

Entrepreneurs, when you've got an idea for a new project, what's your process for turning it into an actionable plan? I'm curious about how detailed you get before you start building.

• Do you create any specific documents (e.g., product requirement document, scope of work, business plan, business brief)?
• At what point do you start thinking about how much it's going to costs and project timeline? Is this even something you consider during initial ideation or do you wait till it's time to start building/find a developer for that?
• And what tools or resources do you find helpful in this early stage? ChatGPT, cost estimation tools etc?

As a serial entrepreneur, I've tried various approaches and my go-to is to start with a brief business outline a lean canvas model and then AI tools to expand on it. It's really sped up my process, but I'm always looking to improve. I'd love to hear about your experiences and methods. What works well for you? What doesn't? Any tips or tricks you've discovered along the way?