it honestly depends what playstyle you want to use for your dragon knight,
i personally would highly focusing on MDPS for dragon knight as i like it the most,
buildwise for mdps dk, id suggest putting kp in the magic damage skills, pike pattk/mattk, and mcritrate.
my personal build is:
15 kp pike mattk/pattk
4 kp elemental resist
the rest is skill kp, forgot exact amounts but i believe its 3 kp in dark dragon mode, 3 kp in the tanking mode, and 5 in all mdps skills?
(this is for level 75 dk)
hope i helped