Step 1: Listen to audiobook that mentions elves/fairies/the fey/some other name that means the same thing. Hear a reference in the text that mentions how the people are strong with magic, but have frail and physically weak bodies. Think of the Linear Warriors, Quadratic Wizards trope.
Step 2: Think of how that form of development might cause some tension between a warrior and a wizard. Begin to formulate the concept. Decide to use anachronic order and solidify the characters a bit. Smile as things start falling into place.
Step 3: Start writing. Realize I have no idea where to start. Start at the beginning and decide to go roughly chronological, at least at first. Brainstorm and make a list of scenes that I want to include. Smile as the plot starts to actually take form.
Step 4: Make it through the first scene and start on the second. Struggle with it. Spend a lot of sessions opening it but not making any sort of progress whatsoever. Tear my hair out over it.
Step 5: Work on actually developing the magic system some more. Get the basics down. Take pride in the fact that the development is moving past "Fire Emblem class system ripoff." Use the inspiration to launch myself back into the project. Feel my excitement build as I open up the document. ...Find myself moving barely five sentences forward as I try to slog through the thoughts.
Step 6: Try again. Cheer as the world starts falling into place a bit. Press through the difficulty of starting and get in the groove. Find out more about my magic system as I write (like the entire empathy system, which I hadn't thought to add). Finish the scene. Stand up and raise my fists in the air in triumph. Uncork the champagne bottle. Drinks all around! It's a time for celebration! Take pride in knowing that, now that I'm on a roll, the rest should write itself. Smile smugly while sitting in my fancy recliner, dressed in my most pretentious robe and smoking five pipes at once.
Step 7: Move on to the next scene and instantly experience a complete writer's block as I realize that I really have no idea what the missions my characters take on will be like and that I don't even know if I'm going to include non-human races in my world.