The VG Resource

Hello I'm back

I have taken several models including Total Overdose characters but I go with the animation that comes with the game, to be more explanatory in the image will be able to see what I mean
my question is how do to make it as presonaje GTA SA (as an example)
and forgive my English

Make the model fit GTA San Andreas' skeleton.
There are quite a few videos you could use for reference like this one:
https://www.youtube.com/watch?v=H2p6mSEXoN0