You don't need to weight paint manually, you can just make blender apply automatic weights to the mesh if you go into the propeties of the bones.
There's a tutorial on youtube somewhere about a rigging tutorial that explains this, it's really easy and just makes you need to use weight paint to fix some parts it missed or fuckd up, which you can test after by moving each and every bone individually.
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There's a tutorial on youtube somewhere
Also that model fuck up on ur pic above is because the mesh is incorrectly painted to the bones.
As said, move each bone around individually after applying automatic weights from bone to mesh and check if each bone limb has the correct mesh moving with it, otherwise correct that with the weight paint tool.
Otherwise nice job on getting a model into source, I find it very hard even myself :ok: