This is how I start every work of mine
In novels I write by pure intuition.
In comics I go the same way in the first chapter/s, and then I make a note with what's going to happen in the next chapter and draw that.
If I calculate, thumbnail, storyboard... I get bored and it takes me triple the time to accomplish the same amount of work, or I just don't do it, or the story changes and those notes I made about long far into the story make no sense anymore 
Not far ago I thought this was bad and I should be calculating like others do, now I went out of that depressive state and create as I've been doing all my life -shrugs-