1) Yes, though presuming the areas had the same data fields, normally you would use 1 table with an extra field for area. You could then restrict to any particular area in a query. You could add a password to access each area, though it should be mentioned that Access is not a high security application (though neither is Excel).
2) Sure; you can export/email in a number of formats, either automatically or via button. You'd have to set up the automatic part, but it can be done.
3) (bonus question?) Presuming you send it in an appropriate format (like Excel), the recipient would be able to edit/add to the data and send it on.