Not necessarily. Not everyone are willing to pay for on-call.

You would be payed a salary but still be expected to be on call at all times. As a one person IT department, you are now the go-to to fix any and everything.

Depends upon what kind of contract you sign. But sure, any place small enough to only want one person is unlikely to be reasonable about it.

Don’t take that job, take another job. There are enough schools and manufacturers to go around.

How do you take a few weeks off from that job?