Creative consists of a big grid of plots. Every plot is 80x80 blocks in size and about 50 blocks deep, filled with stone, dirt and grass on top. Players get to build however they please on this plot, using all blocks and materials in the game. There is also WorldEdit and VoxelSniper for more experienced builders.
/plot auto - Get a free plot automatically. /plot claim - Claim the plot you are standing in. /plot home - Go to your plot. /plot delete - Delete your plot. /plot trust <player> - Invite a player to your plot. /plot untrust <player> - Remove a player from your plot.
/plot flag - Change settings for the plot. /plot visit <player> - Go to someone else's plot. /plot help - Show all plot-related commands.