I am starting up a new league soon: North American Football League http://nafl.simuleague.com
This will be a realistic fictional league. Realistic meaning that teams are located in North America and in cities that could reasonably host a professional sports team.
I am hoping for a 20 team league and we have 14 or 15 teams already set up. We could modify that up or down as needed to start up the league.
Team cities are basically set up, but not set in stone and the team nicknames are really just place holders for now, and can be changed as well as the city (within reason)
The website is up but will be constantly modified to add links, as needed: http://nafl.simuleague.com
We have most of our league communication through a facebook group: https://www.facebook.com/groups/141142319917779/
It may not be the best option but apparently is the easiest for everyone. I could easily create a forum for the league if enough people wanted it.
This won't be a one and done league. I also run a basketball league that has just finished it's 7th season that started up in 2013. https://nabl.simuleague.com if interested.
If interested in joining the NAFL, contact me. Either PM here or https://www.facebook.com/davwms