Creating a checklist allows you to make sure everything gets done before a new starter joins.
To create a checklist:
Head to the relevant person's profile.
Select 'Checklists' in the tab menu.
Click the button that says 'Start an Individual Checklist from Scratch.'
Give the checklist a Title eg 'Sales Onboarding'.
Select an owner for the checklist and set a deadline.
Click on 'Save Checklist'.
Select 'New task'.
Create the tasks and select owners.
All done !