I personally prefer having they in front of me, physically. So I'd recommend writing/typing out brief explanations of your concepts. Just a few lines each, that can fit on a piece of card/paper maybe the size of your hand. One concept per card. Print them out and arrange them in front of you (maybe 10 cards per row, work your way from left to right, and downwards), then when you're happy with the arrangement, number them in pencil. Maybe best to worst, or in chronological order, etc. So it's easier if you need to move things around in future, then you can just change the numbers. This way, after you're done arranging and numbering, you can just sweep them up and keep them in a stack, without worrying about forgetting the order. As you formulate your ideas, go through the concepts one by one.