Well, I wouldn't recommend this, because you are diving in what sounds like cold water, and it wouldn't work with a dry or semidry suit; but when I did my training, my instructor said he didn't care where it was, just that we had to have it on us......so, we stuck them into our wetsuits. (in the top) A little uncomfortable at first, but you get used to it. A leg strap sounds kinda good, but if you were doing any sort of diving involving kelp or other "tagabouts", it would be bound to get caught at times. If you aren't using things would regularily attach to your harness straps (light, etc.) you could put it on there. As to the snorkel, I don't know if you've bought one yet....my instructor told us not to waste our money on a fancy snorkel, as we intend to spend most of our diving time below 2 fsw. I also noticed when I did DPV dives, that anything that wasn't in front of you while you were moving, (such as a snorkel in your wetsuit) flapped around and didn't really stay put.
Anyways, I hope that helps. I'm just about as new to diving as you are, with only 12 logged dives (excluding training dives) so I definitely don't have the best advice.....obviously.