1. No. Of course, YMMV. But when you are an apt manager, you are expected to spend a LOT of time not necessarily working but being available for emergencies and other tasks. When you are an apt manager, you ARE the coverage person. You can't expect the LL to cover for you, you are simply expected to be on-site a lot. That's simply a big part of being an apt manager: you are the responsible on-site person.
2. Depends on the complex. Some do that, many do not.
3. Again, it depends on the complex and LL. My current LL gave me a Visa card to use to buy everything I need. But my last gig, I was expected to front paying for everything myself and then seek reimbursement.
4. Probably. If the complex wants a management team, then yes, certainly. Regardless, most LLs (smart ones, anyway) will vet you and your spouse as if you were regular new tenant applicants, in addition to vetting you both as employees. When tenants come to your door, they will not like being told by a manager's spouse that, hey, I'm not involved in that, talk to my spouse later.
5. Once again, it depends. The complexes I have worked for, that idea wouldn't fly. While I wasn't required to have set office hours, I was expected to at least acknowledge non-urgent requests/issues pretty quickly but immediately for emergencies.