Human vs. CPU control in online leagues

I just found out about this game a few days ago and it looks really interesting and I am considering buying it. I have a few questions about online leagues as I can see joining or running one being a LOT of fun.
Is there a limit on how many teams can be in an online league? Minimum/maximum?
Does the league need to be filled with human players or can there be CPU controlled teams as well?
Is there a high degree of difficulty in running your own league?
I'll probably pick up the game soon and may try to get some buddies to buy it as well so we could be in a league together. I know how hard it can be to run full size sports leagues and keep them filled with active players which is why I ask about CPU controlled teams.
Thanks for any help!
Is there a limit on how many teams can be in an online league? Minimum/maximum?
Does the league need to be filled with human players or can there be CPU controlled teams as well?
Is there a high degree of difficulty in running your own league?
I'll probably pick up the game soon and may try to get some buddies to buy it as well so we could be in a league together. I know how hard it can be to run full size sports leagues and keep them filled with active players which is why I ask about CPU controlled teams.
Thanks for any help!