If you would like to have additional information for your players, you can do so using Player Additional Info. This will be attributes specific to each player that the league admin can fill out and edit.
First navigate to Manage > Teams > Roster Members and click Configure Additional Info. You can use Add in the top right to add your own custom attributes.
If you want some questions to be visible and some to be hidden, you can use Manage Season Visibility to hide/show the attributes for the players.
Hidden: Hide the attribute from all areas except the Configure Player Info page
Private (Internal User Only): Only the league admin can see these attributes
Public (Internal Use & Public Website): The league admin and the public can view these attributes via the Leagues Public Website
Once you have all of your attributes created, you can navigate to either Manage > Teams > Roster Members OR Manage > Teams > Teams and click into the team and click your players. You should see the list of attributes in the pop-up, allowing you to fill the information in for each player.