Hi Kris,
You can use any version of UML you want to. For alternate flows, u can draw it in the same diagram(below the primary flow) and mention it with a text on the left side of the diagram. I followed that way
. Try to put documentation in the diagrams also, so that it will easy for the examiner to understand.
SCJP 1.4, SCWCD 1.4, SCBCD 1.3, SCEA