So how can a warrior sort of class use magic? My magicka is very

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So how can a warrior sort of class use magic? My magicka is very low, so I've started putting points into intelligence, but is there a quick way for me to get a lot of magicka?
I can barely cast any spells, and each skill takes an insane amount of time to increase. I made a 1-magicka costing fire spell that does 1-2 points of damage by touch, because I couldn't effectively cast any other spell, and even with Destruction now at 20 I still miss with it 7/10 times. And it just goes up slower and slower. How will I be able to get alteration up to use levitation, or mysticism for mark/recall, if destruction takes an age to level up?
If I have to pay for training, which levels do the magic skills become effective? I don't want to train from level 5 up to level 100 after all...
A side question: Why is sneak so shit, and when does it get good? It's a major skill but throughout all of my time playing the game, I have only raised it from 30 to 34. I currently have Long Blade at 100, and my other major skills in their 60's. Is sneak even worth it, or should I just not bother?