Could I get a crash course on Magic usage from anyone? I've been working on my character concept and as I got to my spells list, I realized I'm not entirely sure how it would all work out.

[list]
[*] First and foremost, is there some kind of Magicka we need to keep track of, or do we just base it on how many spells we think they can cast in quick succession without being tired?
[*] I've picked from spells that come from the games, but how do those convert themselves into this RP? Do the durations stay the same, or are we allowed to fiddle with how long spells can last?
[*] Can we have a Concentration spell (like in D&D if you know it), which means it is up as long as you can maintain it (usually has a longer duration), but can only have one Concentration spell running at any one time, so should you wish to end the effect or your concentration gets interrupted, you lose hold of the spell.
[*] Are we able to cast with both hands to make more powerful versions of the spell? If that is need to be learned, can we learn it?
[*] How many spells can we choose to know if we're Highly Proficient in a school? On Brynja's CS I see seven. How many if we're Somewhat Proficient?
[*] Can we cast "Self" targeted spells on others?
[*] Can I get a cookie?
[/list]