Jeravic

Hey guys. Im not entirely new to doom and creating levels, sprites, sounds and such, but I have some scripting questions. If I were to create a monster, say something that had the ability to launch its opponents, or the player, into the air like archvile's attack, how would I go about doing this? Also, to use ACS in doombuilder, do I need to download the actual file for it, or is it already included in the editor?