I'm poking around the western Meditteranean building up ships which I have to sail all the way around Spain from England, Sweden, etc. (I'm the HRE). The Sicilians, my long time arch-enemy (they didn't like me sticking the Pope on a pike in front Rome to discourage re-emergences...), have blockaded most of my ports on the mediterranean (i have all from Toulouse to Venice) which is fine for now cause I don't have any ships there yet. When i DO, however, I wanna do this right Therefore...

how do you blockade someone? just stack up ships next to the sea province in which their port lies?

and I assume you break a blockade by moving your ships into the same sea/bay/whatever as the person you're at war with...or am I wrong?

let's face it, I'm a landlubber, an infantry guy really. these boats and sails and water and things scare me, and as I haven't fought a battle yet I don't have a trusty admiral to turn to. Any tips?