Find two orthogonal vectors in the plane containing the points A(-5,3,-4) B(-4,-3,-1) and C(-2,5,3)

Ok so i have that

AB = <1,-6,3>

AC = <3,2,7>

AB X AC = n = determinant of the 3x3 matrix = -48i + 2j +20k

so i need u and v such that u . v = 0 and u . n = 0 and v . n =0

i have a feeling it should be easy but i can't figure it out?