[Loriel]

As osrs said, you need to use some script commands to place custom baddies.
Also, for tiles, you need to understand that Graal has no way to realize wether you imagined your graphics as floor tiles, or wall tiles, or whatever.
You need to either use the as a graphic for an NPC and do dontblock; and drawunderplayer;, or learn how to use the addtiledef commands.