Hi
In my company we have sat up a onboarding template when new employees join.
Each time, the HR team creates a project from the template and name it with the new employee name. They assign the tasks to this employee, IT, HR or the manager. It contains documents to fill in, training,…in brief all what’s needed to make their integration perfect.
Doing so, HR can follow the progress of the process, and check everything is done 
As @Katie_Reynolds says, Asana have a guide for this king is stuff, for instance the following page:
And maybe @Bastien_Siebman also have some other Templana templates 
https://templana.com
Hope that will help you.