Best places to look would the official forums, both the US and the EU ones.
http://forum.us.runesofmagic.com/forumdisplay.php?f=38
https://forum.runesofmagic.com/forumdisplay.php?f=95
All Mages are Fire and Wind. M/K have light spells, M/Wd earth, M/R dark.
There is rebalancing coming soon, so it is difficult to know how advise best. M/K and M/P are good in PvE and PvP. M/Wd probably best DPS atm.
Level Lightening and Flame, don't need so much else at early levels. I suppose Fireball too. Look on the forums and you will get a lot more info.
Atm Mages are not good at end-game, though that is likely to change in a few weeks with the release of Ch4. They OP at low levels and in PvP, and that is likely to stay the same.Added (24.May.2011, 17:11)
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Oh and look here
https://forum.runesofmagic.com/showthread.php?t=99094
for info on Elite skills that generally define your combo, though some general skills from your secondary can also be really good (such as Enhanced Armour for M/K (+60% physical defence buff).
