It is important that new managers know all about the day-to-day nuts and bolts of their role as manager of a department/team, being a functional experts and having had perhaps long(er) service, doesn't necessarily mean this knowledge is there.
People who have not managed employees before can run into difficulties for examples staff that need consistent motivation and direction, conducting appraisals or preparing budgets.
Small companies need to be even more on point with developing and supporting new managers because there is more visibility and impact on the business if they don't; this does not mean necessarily huge investment of cash or time just some creativity.
Thanks to changes in technology it is now possible to access learning via social media platforms and build a network you can call on and get the knowledge you need very quickly.With the almost ubiquitous smartphones and tablets we have also at our disposal the almost perfect environment for pieces of e-learning (games, small bites of audio/video etc.) that staff could tap into whenever it suits or it is needed (check previous posts on Accelerated practical learning , Just in Time Learning for more information).