After your Battle Phase, your turn ends immediately; there is no second Main Phase to set cards or summon more monsters.

You can Special Summon a "Maximum Monster" by having three specific pieces (Left, Center, and Right) in your hand. They combine into one massive monster with "Maximum ATK" and unique effects.

At the start of your Draw Phase, you draw until you have five cards in your hand. If you already have five or more, you draw exactly one.