For a video guide, go here:

http://www.youtube.com/watch?v=BCocmKqNL1w

talk to "Elic"

Kill 10 small aibatts and return to Elic

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collect 5 foform from here (kill small mushpangs):

talk to Maki

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go here, talk to the guy with "?" above his head…or just try each one of them:

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kill this thing, near demain town, the little kids you kill:

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return to Elic and talk to "Kidman":

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Done! grats!

i recomend you sell stuff you get from the job change for cash to buy your armor…

activision (about 400k-500k)
bull hamstern (eh, just use it yourself, nobody buys them)
refresher hold (about 400k – 600k)

as well, you get 60 skill points, i recomend if you’re becoming a FS assist, max heal right away, or at least get it to lvl 15. If you didn’t use any points, you will have a total of 88 points collected after completing the quest.

Credits go to mojo60659.