Documentation for Form action types

We are looking more closely at form action types and we're finding little to no documentation on these.  For example, we want to quickly create a Campaign newsletter subscription form without coding.  This should be action type = Create Lead.  The action attributes requires a manual id be entered I assume.  This should be populated by a list of lead lists at minimum.  No documentation exists to tell us how to setup the fields in the form.  If there is docs, can someone point us to them.  If not, can we get a config for Create Lists actions on this?