Alright, just send me a PM or post here what you'll need.
-For models I'll need a target poly count, and height reference model to work from so you don't need to rescale anything. Also what format to export the mesh in.
-Skins or textures, I'll need a specific reference image for the general look you want to go with. Width x Height in pixels, and what image format you need.
Anything else you think I could help with, just ask, and I'd be happy to help you out.
