I rarely start with ideas; that would be too intimidating. I prefer to just start painting, usually a foundation of weak or vague colors and shapes and let them tell me how to alter, eliminate, and develop them. Freedom and fun--or maybe I should say expression--is what that is about since what the painting tells me to do is, I suspect, most often my subconscious working as my guide. In a way it is me and in a way (relative to my ego) not me.
Nevertheless, the paintings usually get done and turn out better than I expect--but not as good as I hope for.