If you max out Enchanting (level 100 and all 5 perks of Enchanter) and use a grand soul gem, you can enchant an item with Fortify Magicka to reduce the cost of a school by a flat 25%. Enchant a helmet, amulet, ring, and robe, and you get 100% free cost. And then with the Extra Effect perk, you get to do it twice, so two schools. My early game is always stealth archery while i'm pumping enchanting and making money. Once you can start enchanting fortified items, your magicka skills will go up crazy fast.