Anims and skin assistance for my first mod

So, I’m a new mod creator. I’m currently making my FIRST map for my FIRST mod but I’ve made GMod maps before though. I’m trying to get a scientist to sit down but it’s not working. When I tried with the actbusy, he doesn’t move. When I tried with scripted_sequence, he just magically disappeared. also, while we’re in the topic of scientists, How do you make his skin the Pre - Resonance Cascade skin?

Founded in 2004, became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.