Ah! a question I can help answer (these come up all too rarely BAUT so forgive me if I'm a little over-excited *does a happy dance*) I did this for a (admittedly fairly short) while, I stopped doing it for various reasons, none of which were that I disliked it, just various things overlapped and it fell by the wayside.

I always found it good fun, there's a distinct knack to it since unlike normal hockey (normal or ice) you have to come up for air every so often, and if the opposing team is good that's exactly the point the puck will go flying past you. It helps if you already know how to use a snorkel since otherwise you'll have to do what I did and spend a few sessions learning how not to drown (admittedly I was a bit slow at this). Using a snorkel can be learnt reasonably quickly though so it isn't something to put you off if you can't. It does add a new dimension of challenge to it and is a bit more of a physical strain as a result since you're trying to play a fairly energetic sport whilst only intermittently breathing ( I remember hearing that surfers use it to expand the length of time they can hold their breath, but I don't know if that's true or not).

You're also contending with water which prevents you from really thwacking the puck so you do have to guide the puck a lot more and can't pass as far since the playing "field" is a bit smaller this is somewhat moot though.

I probably ought to mention that the sport is non-contact in case you weren't aware although be prepared to have people swim into you occasionally, this isn't painful but you will notice it.

In short I really enjoyed it and wish I could go back, I can't though so I'll have to be content with recommending it to you (I can't give you much advice on strategy I'm afraid, I didn't do it long enough to learn much of that). Give it a go, you may even find that there are some clubs that will lend you kit for a while so you can try it out or maybe there'll be a shop that will let you hire the kit rather than buy it at first.