Here, consider watching MIT's edx course on game design [0]. I found it a good overview of many aspects and a reminder that board games (paper prototypes) can play a role in designing a game. I'm assuming you've already watched Extra Credits videos [1] about beginning.
This reminds me of college where we had to design a game and prototype it with pen and paper; it was a great and fun experiment with comfy results and we nailed down the menus, gameplay and level design before any of us touching the keyboard.