Hi!

1. I always level magicka characters with one destruction staff bar and (after hitting Level 15) one restoration staff bar. For example, I'm leveling a magicka necro now, and the first time I equipped two destruction staffs for her was last night, when I took her to Maelstrom Arena at Level 46.

2. Whenever you have a chance (e.g. when turning quests in or at the end of a dolmen fight), flip to your restoration staff bar when gaining XP. You'll get a large fraction of your XP from kills, and most of those will come on your destruction staff bar. So getting resto bar XP when you can evens things out a little bit.

3. If you play on the PC, you can get an add-on like Alpha Gear 2, which makes it easier to change builds, and change your build more dramatically before quest turn-in.

4. All skills should be leveled at least to the morph point. Your question is really about what skills to keep using after they morph and which ones to stop equipping after they do.

5. My destruction bar skills have mainly been Grave Lord ones, Elemental Blockade and Hungry Scythe.

6. A restoration staff skill that's great to have in all contexts is Mutagen. If you're healing a dungeon, Combat Prayer and Ward Ally are also great ones.

7. From Level 30 or so onward, much of my leveling has come from doing Random Normal Daily dungeons. I think one is fully qualified to start healing dungeons when one has unlocked Mutagen, Combat Prayer and Elemental Drain.

8. Hungry Scythe is a wonderful skill to use when trying to survive a fight. Other non-Grave-Lord class skills I equip regularly are Necrotic Potency, Summoner's Armor (the other morph is only good when tanking or solo) and Spirit Guardian.

9. The necro class has two powerful, broadly useful ultimate skills -- the Goliath and the Colossus. Equip and use them.