Question of the Day: Banner ads

My three cofounders and I are getting ready to launch a new site, “Blahsports.com”:http://www.blahsports.com/. We are only days away from launch and are wrapping up some details. While most of the team is plugging away the keyboard, I am busy drawing up a business plan to present to startup incubators (e.g. “Y Combinator”:http://www.ycombinator.com/ -type of programs). I know we have a wonderful idea and are targeting a niche market — think the next ESPN!– but I still have to draw up financial plans that will include pricing for our banners (our first way to monetize will be ads). This is where my problem starts:

a) How much should we charge for our banner ads?

b) Where can I find compatible sponsors (banner clients) for Blahsports?

c) Should Blahsports even put banners up on the homepage right from day 1?

d) Or, should we use Adsense to get our first dollars?

I know the Internet is chalk full of info, but there is just so much to go through and I was hoping that I could get some juice out of the readers of Found|Read. However I am sorry if these question are to elementary… but the worst question is the one that goes unasked ;-) !!