Also you can have different items by changing the type of layout the map is. You can link maps together using commands, not to hard.. look around. It's easier to make seperate mini maps and link them all together. To change the type of map follow these easy instructions.
First right click over your Map. Then Click Map Properties
From there a window should pop-up. Then click the tab and a list comes up, pick which one you want then press ok. Usually each one has it's own distinct deflaut tilesets.
After seeing the first pic, I would hope making a new map wouldn't be too hard. Also as I say, look around how to find out how to link maps if you choose to do so. If not, just look for Tilesets and upload them into your project through the database.
*Edit*
Looks like a few posted before me, still hopes thise helps out*