• Setting up a git repo for your game
• Setting up your hosting page (itch.io or whatever)
• Creating a Trello board for your game to track to do items (trello.com)
• following me on twitch.tv so you can have your game streamed and hangout ( https://twitch.tv/tiger_j )
• Brewing coffee, tea
• making sure you eat, shower, go to the bathroom

These are all great things to do before it starts. Good Luck!