Sorry for the noob questions, BUT...

Let's say you take over your enemy's disclosed country AFTER all the revenue has run out for that country...do you get indemnity, and do you get revenue rounds all over again, or is it some freakish combination of the two?

Thanks

If you take a disclosed country, you get the indemnity. Period.

A country only gives 10 turns of revenue, regardless of who owns it. Once those 10 are used up, they never come back, no matter who takes it.