Thats what I’ve done so far:

• Brainstorming for an idea.
• Fleshed out the idea, all an some pages of paper
• Made 2 little proof of concepts for the core mechanics (network stuff)
• Made a milestone plan with 16 Milestones and a time schedule of 25 hours (need time to sleep and a time-buffer)

Beginning to work on the game now. Production-Phase 😉