Teams
WFM allows you to set up a roster for each team. If you have only a single Team then you will still need to create a create with all of you staff as team members.
Create a new team by navigating to Users | Team Management.
Team Type
For an Inbound team select ROSTERED_INBOUND.
For an outbound team selected ROSTERED_OUTBOUND.
For a blended team select ROSTERED_INBOUND.
Now add each staff member to the 'Selected' list to add them as team members.
Inbound Teams
For inbound teams you also need to define the Queue Filter (you can ignore the Skill Filter for the moment).
Queue Filter
The Queue filter describes the set of queues that the team takes calls from. This is important as the Roster Forecasting tool needs to know the set of queues that are being manged by the team. As such you need to ensure that you keep the queue filter up to date.
Add the set of queues that this team managers to the 'Selected' list on the Queue Filter tab.