Questions about the game

By Wh1tewolf19, in Star Wars: Edge of the Empire RPG

Hey I'm wanting to get in this game, but I had some questions. Do I get the edge of empire beginners game or can I jump into one of the other ones? How does the force work in this game and do melee weapons exist? Do I need the other booms to use their races/stats. Do the rules or gameplay mechanics change from book to book?