As of the end of the 2016 AFL season, 12486 players have played AFL football. There are now articles on all of them. See the Petscan list (switch to CSV to download the full list).
But, there are still lots of tasks to do. The Project's Cleanup list is updated weekly on Tuesdays.
To help in the tasks below, the following online references may help:
The Footy History forum on BigFooty.com hosts many discussions and attempts to find detailed information on former players.
Each state's historical births/deaths/marriage records can also help, but the level of freely available online info varies by state. Genealogy websites like Ancestry are generally not suitable to use for confirmation, but may offer a lead or direction to search the other sources.