I'll start on the frost tree.
Improved frostbolt: 100% filler talent, and I'm not going frostbite because it splits up the group making it impossible to AoE properly (at least it did in lvl 30 ish).
Ice Floes: CDR on important spells, not a must have though, but anything else in tier 1 would be stupid.
Ice Shards: Important DPS tallent that works really well with Molten Armor.
Precision: For hit chance when doing orange mobs. Not super important when doing content on your level.
Permafrost: More slows, which ends up in more blizzard ticks and more damage. Very important.
Piercing Ice: 6% more damage, on frost spells. Pretty important.
Icy Veins: A simple DPS cooldown. Pretty important.
Improved Blizzard: Almost impossible without it. A must have talent.
Arctic Reach: Longer range on Blizzard and Frost Nova (and cone of cold). Pretty important.
Cold Snap: A "oh fudge!" button or DPS cooldown reset button. Pretty important.
Improved Cone of Cold: More damage on Cone of Cold. Impotence will depend on how much you use it. For me it is more of a filler talent, but it is very usefull.
Winter's Chill: A 5% crit chance buff. Works very well with Ice Shards.
Now to the arcane tree.
Arcane Subtlety/Focus: These are 100% fillers, Arcane Focus buffs Arcane Explosion slightly though.
Arcane Fortitude: This is just survivability, and it's not super important. But it helps when/if you make a mistake.
Arcane Concentration: Mana sustain galore. Very important. Might be possible to go 3/4 points in it.
Spell Impact: Mainly a filler talent, but gives some extra damage to Arcane Explosion and Cone of Cold. Not important. Maybe Magic Absorption is better?
Student of the Mind: More spirit is important because we run Molten Armor. Pretty important.
Arcane Shielding: Reduces the drawback from Mana Shield. Not important, but nice to have.
Presence of Mind: Important because of the talents it branches into other talents. It can be useful for an Instant Flamestrike though. Very important.
Arcane Mind: More intellect is good I guess. But it is not super important. But it is a nice filler.
Arcane Instability: 3% more damage and crit chance is just a great DPS buff and it branches into Arcane Power. Very important.
Arcane Potency: 30% more crit chance every time Arcane Concentration procs. Note that this is just for the next "wave" of ticks from blizzard (I think). It is still a great damage buff. Pretty important.
Arcane Power: 20% increased damage for 15 seconds is just insane, especially when you combind it with Arcane Concentration so that it has no drawback. Very important.
Incanter's Absorption: It makes Mana Shield and Ice Barrier better. Not sure how good it is with just Mana Shield (close to 200 spell power from a max rank mana shield level 79). Not important, but fun. You can't really pull and Ice Block with this though.
Mind Mastery: More spell power, and it works well with Arcane Mind (I think, haven't tested it).
I think I would try and go this in level 80 if I manage to play without Ice Barrier:
https://wotlk.evowow.com/?talent#ofc...x0bZMIcIsbz:ik