This is important exercise. I was involved with startup that was ad based for revenue. On paper, you can make the numbers add up and everything looks good. Knowing what numbers you need to hit is important. The hard part is getting the 104,167 visitors. Saying 'all we need is 0.01% of facebook users and we are rich' is not addressing the situation.

How are you going to attract visitors?

That said, you've already made it this far which is a great firs step. Good luck.