[Halius]

I can't speak much to necromancer (only have a level 10) but for Magician it is going to be a lot of sitting. But this could actually be a benefit to you when you get to a higher level, as you sit to med you can always have a character logged into red and play a different class (that's what I have been doing lately).

Unless you have a pocket chanter ready to hit you with clarity you will be medding a lot. One way to mitigate this is to only throw low level nukes at a mob once your pet gets them running but then pet will eat 50% exp and around level 25 or so pets begin to get overpowered by mobs so you will be using mana healing or chain summoning anyways.

As Samwise said, a good option is to find a healing duo partner so that you don't have to worry about pet dying and the 50% exp penalty is negated since you are in a group.