If you're going to roll a Nord, it's important to get your IQ in decent shape as quickly as possible, given how Nords have the worst base Intelligence. I only did it to get my "leveling" out of the way.
Whether you need to refill often or not depends on your playstyle, but you do need to keep an eye on it at least. If you're slinging spells constantly, then you need to make sure you top off your Magicka regularly and make sure you have enough stuff to restore it. 0.1 Weight custom potions are your best friends.
Also, keeping a backup weapon is handy in case you can't recover magicka or if you plain don't want to use spells. I kept a staff handy.
As for the Apprentice, I actually never used it until recently. I think having a Nord benefits you more than a Bosmer in this case, since you at least have only a 50% weakness to frost. It's...something at least.
The only advice I have is watch out for spells. Send a summon to fight for you if you can. I'm playing an Altmer Apprentice Spellsword and he basically explodes from getting hit by even the most basic spell. Let's just say I love a challenge.