I know that you can train for spells with training points, but how do you get them? I get one like every five or so levels, but is that the only way? And how many levels do you have to wait to get another one?
Time to consult the book of knowledge - the Player Guide! You can always find the player guide by clicking on the Player Guide button at the top of this page.
You will receive one training point every 4 levels till 20. This means you will receive them at level 4, 8, 12, 16 and 20. After level 20, you will receive one training point every 5 levels. You can also receive training points through certain quests. In order to learn higher level spells of a school, you have to first learn the lower level spells.