Bobby, you don't need to download Mixamo. It's a (free) online rigging service, and you can add a lot of animations to your model. It's best to upload your model (a neutral pose is recommended - T-pose would be best, but if the arms are slightly hanging down, it works as well) as an FBX . Thus you can embed the textures. Then you can export the whole thing as an animation (FBX again), and import it in another 3d app (so Blender seems to work, as Doc wrote) to finally export an OBJ sequence.
