It’s important to understand that there are different options when it comes to employing a technical support team, whether internal or external to the company. Whilst there are industry commonalities between companies in the field, each company is unique in their technology stack, their processes, their goals, and the way they choose to engage with their staff and clients.
As a blanket rule, majority of companies with 5 to 10 staff, depending on the industry and company structure, could comfortably operate with 1 internal technical support officer. Generally, the tasks of this person would be setting up new staff hardware and software and resolving technical issues that arise. What you receive in whole for hiring an internal technical support officer is dependent on their current skill level, protentional extra utility, and if they are willing to continually upskill.