Unable to import 4 separate Apple MAC calendars to Outlook; and how do I sync MS Outlook for MAC across iOS devices?

I have recently downloaded MS Office for Mac and would like to start using Outlook instead of Apple Calendar.

MS Outlook for Mac version 15.18. 

All iOS devices are on iOS 9.2.1; Mac using OS X El Capitan V 10.11.3.

I am having 2 problems:

1) Although I was successful in adding our 4 email accounts to Outlook; I am struggling with importing  my 4 Apple Calendars into Outlook.  MS Outlook instructions was to export the Calendar file to a location on my MAC; and then drag the file over to the Calendars listed in the left menu in the Outlook calendar.  I was successful in importing one; but the other 3 won't import.

2) Once I get my Apple MAC calendars into Outlook, do I download the Apple Outlook application to my iOS devices and will they sync with all my iOS devices?