Marjorie,
All expectations in general have to be MUCH more specific. The set of course expectations you list on your first online course will change completely buy the 3rd or 4th time you teach it (and likely sooner). You have to be very clear on communications: how, when students cna contact you; when to expect responses, etc. You can clearly articulate computer requirements, although you never know unti they can't successfully complete an advanced computer assignment that they don't meet those expectations. Give clear schedules and due dates. Clear expectations reqgarding late work and consequences. Anything you would cover in a regular class plus more on communications and in greater detail.
Herbert Brown III