3D Studio uses .3ds files. You can get plugins for it that will handle .obj files and if you really want to use models from 3DS in Poser (or the other way around) I'd suggest you do that. Poser has some basic ability to handle .3ds files but it's not good. I've never seen any tutorials on the first two things on your list. I'd suggest you go for general 3DS modelling tutes and adapt them to what you are doing. There are very few texturing tutes around of any description. Camo shouldn't be too hard though.

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