Hey! 2d and 3d armor modeling gone wrong!

HI, so I've been trying to download some models and textures from blockbench to mcreator. The things I'm trying to download are 2d and 3d armor, it's just a regular piece of armor like in regular minecraft, but than I'm adding extra 3d parts to it. But by now either nothing shows, a broken texture shows, the 3d model shows, or just the texture show... And to top it all off I can't get images to wok on the mcreator forum lol

Help is appretiated ;]