First read
this.Once you know how to work with general modding crap, the actor .ini files are in:
<Your CC Dir>\Base.rte\Actors\<Actor Dir>.
Also the other modules contain Actors for their faction. (e.g. Coalition.rte\Actors\<blah>)
Look at the vanilla actors, see what values make them do what, change values and see what happens. (or search the forums for a specific variable name, something will turn up.)
Other mods can also be a good source of learning and inspiration.