Here is a video that explains 3 different types of ways to set up using averages for your league.
Option 1 : Using Average, but using a fix average for the first X amount of weeks.
Option 2 : Using Average and picking up from past history on CompuSport.
Option 3 : New users, using average and picking up manually written Scores and Games Played from the past.
Here is the video : How to set up Averages