How do you make and start custom league

[Unpaid_Assassin8_PSN]

How do you make and start custom league and get out of forming status and be able to add players in later

[HustlinOwl_MLBTS]

Would need an additional player to invite, join as a team then abandon league and reinvite. Rinse repeat until full

[Unpaid_Assassin8_PSN]

But how do I get out of the forming staus of it it says need more teams....how many teams need to be in it b4 it will start