[Beginner] Pointers about magic usage

[Alneyan]

As you can guess by the title, I was wondering about the best way to use magic when you are still learning the ropes, and how to design your Pretender magic paths.

While for now I have been having some success with *Coughs* the ever-so diplomatic Ulm, my Pretender did not do much in these games, which were won because of the low number of Normal AIs around, and not because of some clever strategy. My Pretender was then bases around Earth (5 if memory serves), with a few additional paths. (Mainly Water and Air) As it wasn't exactly used besides forging some items, I would like some advice about how to design a magic Pretender.

With a Nation strongly focused in a single path, should my Pretender pursue this path as well, or should I go for another complementary path? And likewise, would it make more sense to complement a nation strong in a single path with a Pretender focused in a single path as well, rather than using a Rainbow Mage? (And vice versa)

I am not asking for an advancer strategy, but merely for a few pointers to have a good beginning with the game. Thanks in advance for any help!