I am new here on MWG, but not to Warhammer. Thus, I know some tactics and have a few battles under my belt. But that is mostly with Eldar, and so i wanted to make an army with the Emperors Angels of Death. This is the Army I have come up with:
Legio Aves means Bird Legion. the fluff for these guys is that they have been created from Hawk Lords gene-seed, to aid the Imperium in its struggle for survival. The Legio Aves adorns themselves with the same purple armor as their ancestor chapter, but wears the left half of the upper armor in a blue/gray-ish color, I think Shadowgrey is the paint for the job. The chapter is yet to be designed, but I'm fantasizing about something around a wing, like the Eagle warriors. All the squads are marked with a symbol for their list part (HQ, Elites, Troops), centered around an X. The HQ have the whole X, the Troops have the lower half, the Elites the upper half, the Fast Attack got the rightmost part, and the Heavy Support the leftmost part.