mmm i know the basic rule it look like a toned down version of magic (finaly no more mana screwed! *dance around*) but knowing more is never a bad think thanks
oh and as i already sayed duel master is maked by wizard of the coast same guy that do magic the gathering and neopets and the gba game was maked by wotc and takara
P.S
Nature - Nature is literally the forest and animals. Nature likes to generate alot of mana really quick. With more mana, the quicker you can play bigger and better spells. Green doesn't destroy things as well as other colors. Green doesn't have too many big attackers either. It relies a bit on defense.
Fire - If you want huge attackers, Fire has them. Home to Dragons and some machines. Fire can blow up cards in the mana zone and even some weaker creatures. Fire really has no defense or "blockers". Alot of the better fire cards also cost alot of mana.
Water - Water is home to virus, liquid people, and beasts of the sea. Water can send card in the mana zone and creatures in the battle zone, to the owners hand. Water cant destroy anything, so it has to rely on "return to hand" things for its defense. Water is the best at drawing cards. Water has a few attackers, but its better on defense.
Light - Light is home to Angels and other deities of the sky. Light is really big on defense, if not the best at it. Also Light will fight back if you provoke it. Light doesn't destroy things as much, but has a good balance between its attack and defense. Light likes to power up many small creatures to have them team up for big attacks.
Dark - Dark has a little of everything. However, it comes at a price. It is the best at destroying creature cards in the battle zone. Dark also has alot of huge creatures ready to attack. However, Dark's power comes at a price, sometimes you'll have to sacrifice your own creatures or even give up some of your shields. Dark has a bit of defense, but it is really better on the attack.
mmm... i feel little deja-vu