@ArmaniAdnr Pro tip: i'd suggest you watch missions cutscene compilations and watch mission gameplays.
when for example you see a character do a cool pose, remember what the pose was about what was the character holding in that scene(object,prop,car,weapon...ect), the name of the ped who was he interacting with (other peds), the name of the mission... ect and use that to your advantage as keywords to look for animations in menyoo. It may take a while to find some good animations at first but once you understand how to look for animations you'll get enough experience to look for more complicated animations.
pro tip 2: if you're looking for animations for the main characters look for animations using these keywords
1- player_one (Franklin)
3-mph 'original online heists'
4-player_zero (Michael if i'm not mistaken)
5-player_two (trevor if i'm not mistaken)