[RESOLVED] set sizes in rm2k3?

I just started using rm2k3, and I got oh so confused, I tried to import some stuff, like character sets,a face sets and animation sets (like the hit, attack ans stuff), yet it keeps rejecting them, saying that they aren't the right size.

And also, can someone translate the following:
(from resources, can someone tell me what they are?)

Battle
Battle 2
BattleCharSet
Battle Weapon
CharSet
ChipSet
FaceSet

Someone? And also, how hard would it be to make a sprg esque game in rm2k3? I think I could pull it off.