Okay, I kn ow this was all done with Blender tutorials for the shield and hammer and downloading the Iron Man models (because there were no well-made tutorials out there that I could understand or follow) and has absolutely nothing to do with Hitfilm but I wanted to show off my results and this was the only place I knew about to do that:
The Helmet model was by 3dinator at Free3d.com
The Arc Reactor was by Jamezzz92 also at Free3d.com
I did the Shield from a Youtube tutorial by a yong fellow named Scotland Dobson and Thor's Hammer Part 1 was by CGMasters (I purchased the 2nd part which covered all the nice texturing and such.)
Anyway, I hope I'm not violating any rules and you like it.
Edit: I forgot the background is free HDRI lighting the scene from HDRIHaven.