Poetry format is 1-3 or 1-5, 3-5.  In your first example, you would do the poem with 1-3 margins.  In the second example, the only question would be whether or not that indention on the first line represents a pattern (for instance, is every other line indented to 3?).  If there is no pattern, than the same 1-3 margins should be used.

Cindi