How Do I Create A Free Fantasy Football League On Yahoo That Is Open To The Public.?

I only know how to create a private league that i have to invite people to join. How do I create a league that is open to the public?

What Site Offers A Highly Competitive Fantasy Football League That Is Free?

I know yahoo lets you pick between casual and competitive, but my experience is there is little difference. I am looking for a site that is home to hardcore fans that will be very difficult to win my league. Any ideas?

Where Could I Create A Keeper Head-to-head Fantasy Football League?

So me and my friends have been having a yearly free fantasy football league on yahoo. Recently, I had the idea of creating a keeper league since it has always been the same guys and it would make the league more competitive etc. We usually do head-to-head format and would like to continue doing so. So please let me know of where I can make a keeper league regardless of whether I have to pay or not to make it.