Welcome Kat! I've just recently started posting here, and I'm pretty much in the same situation as you are, having done most of my dives in warm waters. I did my first local dives (shallow, shore dives) in the summer and, although conditions are very different from the Caribbean (the limited visibility is what struck me the most), it's definitely a worthwhile experience and I'm planning on keeping diving locally... though with the current temps it'll probably have to wait until next spring
Nuno
Nuno