Fleshing Out This Char - Help/Advice? Options

[Leviathan]

Hey, I've decided against my mage idea, and am going with an Adept.. a Troll Adept..

I was hoping I could get a bit of help fleshing my char out etc.

Background: Used to work as security for a minor Corp, where his higher than average intelligence and the trollish stigma made him effective at keeping people off balance, or getting them to back down (as well as damned hard to kill).

Now, I havn't figured this bit out yet - Either he faked his own death after wtinessing something the Corp had done, OR he was left for dead by the corp after a large fight. (Hence the reason he has no SIN).

Personality wise, he is highly intelligent and strong willed, but lets others do the talking (unless it's coming to intimidating someone), in battle he prefers to get into close combat (but can hold his own in a firefight), and often steps in front of party members (especially mages) to shield them.

Stats:
Bear in mind this is including the adept powers of:
Improved Body (4)
Improved Quickness (2)
Improved Reflexes (2)

And the Edge:
Bonus Attribute Point (Body)

Body: 16 (17 with Dermal Armour)
Quickness: 6
Strength: 8
Charisma: 1
Intelligence: 4
Willpower: 6
Essence: 6
Magic: 6
Reaction: 9
Initiative: 3

Skills:
Language:
English - 4
Japanese - 2

Active:
Pistols - 6
Athletics - 6
Athletics (Escape Artist) - 5(7)
Throwing Weapons (Grenades) - 5(7)
((Plus one more primary weapon skill, waiting till I get hold of CC before deciding))

Knowledge:
Gang Identification - 4
Local Neighbourhood - 4
Corporate Security - 4
Secirity Devices (Detection measures) - 3(5)
Architecture (Corp) - 3(5)

Thats all I've got worked out so far, any advice/ideas?

Also, could someone tell me how learning Adept Powers works? Can you use Karma to increase them directly, or do you increase your Magic stat like normal and that gives you an extra point of AP?