I always make sure to get a Seductive Charm spell early on.
If you're doing the Mages Guild Recommendations, then doing Bravil early gets you "Captivate" which is Novice level, so anyone can use it. That quest can be done without any pre-requisites (except for a small amount of gold) as the scrolls do it all for you. Then you're all set for Bruma, which gives you another spell to use, (Minor Latch Crack) although that one is Apprentice level. You get that spell even before you complete the quest.
Doing the Skingrad quest gets you a Weak Fireball spell at Novice level if you hit all the right dialog topics, again, before you do the work, so you can pick up the spell, use it elsewhere, and then come back to complete the quest later. Cheydinhal gives you another spell - Buoyancy - with two effects, feather and water breathing, again before completion.