This is a creative assignment, so you can put almost anything within reason. His origin, according to the poem, is from the Land of the Geats. For height and weight, I would put something pretty tall and pretty heavy because the poem refers to him as a giant, and he is strong enough to defeat formidable foes.
As far as skills, he would probably be adept at knife weilding, battling dragons, inspiring fellow warriors - things like that.
You can be very creative as to the objective. He could be applying for a battle training company, a dragon killing business, or for a position as lead warrior.
This sounds like a cool assignment - have fun with it.