By posting a thoughtful request for advice, you've taken your first steps into a much larger world...
I'd say that no one else can possibly tell you what your RP "
should" include. Assuming you want to hew to the Liberal Holder line, I'd suggest the following:
> Read as much as you can about the
Amarr Empire. Probably other repositories exist, most notably from other Amarr roleplayers and RP corporations.
> Make friends with RPers who have similar interests. (This board is one place to start, though of course other places exist as well.)
> Decide whether you want your RP to focus primarily on in-game actions reflecting your character's beliefs, conversation and debate, some mix of the two, or something else entirely.
> Ignore the whining threads and the endless rehashing of "DIE SLAVER SCUM" -> "You need God's light, my child" -> "YOU NEED MY AUTOCANNONS" -> "You pathetic tribal" etc etc. Not to say that interesting Amarrian/Minmatar discussions and RP don't exist, but you'll need to quickly determine which threads have value and which do not.
On preview: Basically, what Ashar said.