i have just finished a round robin but we thought it might be better to play three or four games against each other player and have a little league
We can do the league outside warzone but wondered if there was a way to do it from within warzone

The easiest way is to use http://wztourney.herokuapp.com/

If you want to stay within WZ itself, you need to create your own league by making a couple tournaments or games yourself.

Your are lucky, there is an excellent tool by -B (https://www.warzone.com/Profile?p=2719017226):
https://www.warzone.com/Forum/400821-new-clot-httpwztourneyherokuappcom

link to the CLOT:
https://wztourney.herokuapp.com/