Morten Monrad Pedersen
+1 on pretty much all that Morton said. Do yourself the favor and buy all the gameplay expansions (teams are fun but not as necessary) but start out using the base game and them add them after a while once you and your opponent got the timing down.
I'll +1 you back . I also added them gradually, though I think that I added the three that each adds extra of one specific player type at once for balance. Don't know whether that was actually necessary.