Where do I start? - First Thoughts

I'd like to design something... Where do I start?

I am thinking about focusing my dissertation on design and I will use my existing knowledge of flash action script in order to show the results achieved from my research.

My thoughts so far are along the lines of 'making a simple yet deep digital game through the use of meaningful choices.'

Since I have yet to undertake the research, I might have to tweak this idea slightly once I am better informed of the proper meaning of depth in games and what constitutes a meaningful choice.

Edit: The next blog post pretty much makes a 180 degree turn due to some new-found inspiration. Hopefully this will not happen often as I need to decide on a single goal.