Back in the day my first lvl 50 was an ice/storm (my second was a fire/storm).
Some random thoughts
The thing with a ice/storm to me is to decide wether you wish to be more melee focused or ranged focused. I choose the melee type because it more suits my style.
Shiver and Snowstorm pretty much cover the same thing, and Artic Air is similar also but with a confuse added. So you can skip at least one of the three. Shiver is a nice sized cone from what i remember and Snowstorm is one where you just toggle it on a bad guy (has a nice -Fly aspect to it also). Artic Air is a self toggle that has a confuse added to it. Each has its strengths. Personally I preferred Snow Storm and Artic Air. Try all three and eventually settle on the ones that fit your play style.
Ice Slick and Freezing rain is just pure fun. It's great control and helps teams mow through enemies. Big problem in teams is that teammates would always seem to use their immobilize powers on the enemies and nullify the knockdown. But with the newest patch that shouldn't be much of an issue any more.
I hope this is a team build that you have because leveling will be ultra slow if you solo. When I was leveling mine I had Block of Ice, Chilblain, and Air Superiority to help with soloing. I slotted the later 2 for damage. When I hit 50 I dropped Air Superiority and Chilblain.
Your blue bar will be tough to maintain without help. Storm just guzzles endurance. Running Maneuvers and Tactics will be rough until you slot up for it. I didn't really run with them until I 50'd.
Thunderclap can be very underwhelming without any other stun to stack with it. I liked the power but used it more with my fire/storm than my ice/storm.
Tornado on the other hand is just pure fun. immobilize a foe and drop the nado on them and watch it grind them down.
I always loved Artic Air. I usually stayed in the middle of things and the confuse aspect when slotted can be very useful. It is an endurance hog from what I remember. And back in the day it was great to spot those pesky stalkers in siren's trying to sneak up on me.
Flash Freeze was always my Oh No! power. Just drop it and sleep the enemies. In groups it wasn't to useful, but had it's moments.
O2 Boost is a ok heal. You will never be considered a healer (but hey, if your playing storm, healing should be the last thing you think of). The side effects of the power are the best part of the power. Protection from stuns, sleep and end drain. I used to get asked a bit from farmers that would want me their to just apply o2 boost to them as they farmed.
That's all I can think of at the moment. I hope it helps. Good luck, it's a fun combo.