How do you get an easy great sword on monster hunter freedom unite

If you mean easy as in beginner weapon, the guy who rescues you from the snowy mountain gives you one of each type of weapon, tap the square button in front of your big chest in your room, then click on change equipment, then click on the great sword. (bone blade) OR you can buy the alternate great sword for 1000 Zs at the place where you upgrade your weapons, there should be a cat laying on a counter with a guy standing next to it. (Buster blade)