Importing sprites help

[Ultimecia]

It really depends on the RPGMaker version you're talking about. I know handle versions prior RPGMaker XP, they have specific dimensions and 4 directions (Front, Back, Left, Right) and each one got 3 frames (stopped, 'left', 'right'). But XP and onwards they got one extra posing (the 'stop' in all 4 directions, separated from the walking ones) and they keep a certain proportion. To do additional posing you need to do additional sheets... Or used to need XD
Also, usually the 0 color in the index was the alpha (transparent) one for RPGMaker, but I'm not sure if it still is. But anyway you're going to need a graphic program. And it's better check those on a RPGMaker forum too