As your company grows, you will likely find yourself spending more and more time and Money on IT services. If you can't afford to hire an actual IT person, then you will be reliant on outside vendors.
There are two models for this:
Break/Fix IT Services
Break/fix IT is like appliance repair. When something goes wrong, you call the technician, and they come over and fix the problem. You pay them by the hour and for any parts you need and nothing more. Using this same model, you might also bring in an IT tech to handle upgrades, cybersecurity improvements, or train your employees on new software.