"... Here's a very rough mockup that was put together with some brainstorming, just to give an idea of what the first user introduction might be like ..." Bet

"... Here's a very rough mockup that was put together with some brainstorming, just to give an idea of what the first user introduction might be like ..." Better. Now make some more that demonstrate your key points and that will also help you start building. Wish you'd put this up first as it starts to put flesh to words (idea description).