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4. BUT it will only show one contribution on the day of the contribution (i.e. the recurrals won't get entered, you'll have to import them).5. IATS will NOT process the initial contribution, only the recurrals (i.e. starting a month from the initial contribution).
To attempt another answer your other question - the first transaction will be recorded in CiviCRM, and the fact that it's supposed to recur is also recorded.
All subsequent 'recurring' transactions will go through IATS, but CiviCRM won't get information about them, so they won't appear there unless you manually import them.