Get yourself a caligraphy kit and practice writing with that first.
A decent kit will have a few various nibs you can practice with and the ink is, usually, included in the kits.
Some will have refillable pens but most have insert-cartridges that get pierced when you screw the nibs onto the body of the pen.
It's the best way to see if you really want to follow your yearnings for fountain pens and it's also a neat way to meet the ladies. It brings out the "artsy" part of your personality and some chicks dig that kind of "spirit" in guys.
What you got to loose?
BTW: I've been into caligraphy for quite a long time...it started when I ran across the fountain pen collection of my grandparents after they passed away in the 60s. What I wouldn't give to see those pens again and see, exactly, what my G-Father had in those cigar boxes.
Go to Sheaffer Pens and see what they have to offer...I've bought two the past few years and they ran me about $70/piece plus the ink cartridges and related materials. They also include the "bladder" for those that still use the jars of ink...which they sell too.
Good luck exploring the possiblilities!