The App Store is open to Staff - you can install apps using an Apple ID. If you would like to create a work-related Apple ID and need support, please use this support article https://support.apple.com/en-us/HT204316 .
Please be aware that all apps must be vetted by the technology department. The app's Privacy Policy and/or Terms & Conditions will be measured against a rubric for approval. If you attempt to install an app that isn't on the vetted list it will look like it was installed but then immediately disappear from the device. Please email technologyservices@ssdmo.org with the name of the app and the app developer (if known) and it will go through the vetting process.
For PAID apps purchased by SSD it depends on who or what department provided the iPad. Contact the department that provided the device to inquire about their purchasing process.