Setting up learning plans

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Hello!  I'm wading my way through Taleo Learn as a new user/admin and new to my company.  Though we've had Learn for a couple of years, there hasn't been a clear strategy in place for setting it up.  I'm finding that the learning plans have been set up by user so that almost all users have an individual plan.  Right now we're small, and it's manageable to do it that way, but it won't be for very long.  What is the best practice for setting up learning plans--by job function, competency set, skill, or individual?  I would greatly appreciate some