I want to start a new project but I'm a beginner. I already have most of the ideas in terms of gameplay, lore,... I have written pages of notes and concepts about the game. Basically, I know most of the things I want to put in my game and a big part of their design is done.
I made a few small projects with Unity, I know how to program, I know how to use Blender and I have edited some textures. Basically, I know the basis most of the technologies I'll need to use.
The problem is that I don't know where to begin. Should I start with modelling? Create maps? Start with scripting? I'm undecided because many of these tasks can be done in parallel if you have people working with you and are more or less independent in early stages of development.
All of the answers I read were for people who didn't even have ideas in the first place and knew nothing about development. My problem is more about project management after the design phase.