I'm glad that you asked, my young nemaisare. *cue sinister laugh*

Basically you both start with a set amount of HP, you have 5 monster card zones and 5 spell/trap cards (+1 field card) zones to defend yourself with. You can normal summon a monster once per turn, though there like aRe a bazillion ways to bypass this if you're into the summoning style. But you can use or set as many traps and spells till the zone limit per turn. 

Now try to get each other to 0 Hp or deckout! (something I take a million years to do but inevitably do) :)